Pages that link to "05000423/LER-2012-001, Regarding Main Steam Line Pressure Transmitters Declared Inoperable"
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The following pages link to 05000423/LER-2012-001, Regarding Main Steam Line Pressure Transmitters Declared Inoperable:
Displayed 5 items.
- 05000423/LER-2012-001 (redirect page) (← links)
- 05000423/LER-2003-001 (← links)
- 05000423/LER-2001-004 (← links)
- 05000423/LER-2001-003 (← links)
- 05000423/LER-2001-002 (← links)
- 05000423/LER-2001-001 (← links)
- IR 05000336/2012003 (← links)
- IR 05000245/2012003 (← links)
- 05000423/LER-1996-045, Forwards LER 96-045-00,documenting Condition That Was Determined at Millstone Unit 3 on 961107.LER Submitted Pursuant to 10CFR 50.73(a)(2)(ii).Commitments Encl (← links)
- 05000423/LER-1996-044, Forwards LER 96-044-00,documenting Condition That Was Determined at Millstone Unit 3,on 961108.Commitments,encl (← links)
- 05000423/LER-1997-005, Corrects Numbering Inconsistency in Commitments Addressing LER 97-005-00 (← links)
- 05000423/LER-1996-042, Provides Util Revised Plans for Implementation of Commitment Made in LER 96-042-00 (← links)
- 05000423/LER-1997-003, Forwards LER 97-003-00 Which Documents Condition That Was Determined at Mnps,Unit 3 on 970113,per 10CFR50.73(a)(2)(ii) (B).List of Commitments,Encl (← links)
- 05000423/LER-1997-013, Provides Revised Schedule for Submittal of LARs Identified in LER 97-013-00, Failure to Meet General Design Criteria 57 for Ms Supply Containment Isolation Valves to AFW Pump Turbine. LAR Will Be Submitted by 970630 (← links)
- 05000423/LER-1996-047, Revises Commitment Made in Response to LER 96-047-00 Re Seismic Qualification Training (← links)
- 05000423/LER-1996-050, Revises Commitments Previously Submitted to NRC in LER 96-050-00 Re Range of Control Bldg Chilled Water Pump Gauges Used for Surveillance Not in Accordance W/Asme Chapter XI Requirements (← links)
- 05000423/LER-1997-011, Provides Revised Schedule for Completion of Corrective Actions Committed to in LER 97-011-00, H Recombiner Heaters Potentially Outside of Design Basis Under Degraded Voltage Conditions (← links)
- 05000423/LER-1997-024, Revises Schedule for Commitment Made in LER 97-024-00, Engineeered Safeguards Bldg Monitor Noble Gas Activity Monitor Sensitivity Not Meeting TS Requirements (← links)
- 05000423/LER-1996-037, Revises Commitment Previously Submitted to NRC in LER 96-037-00, SFP Cooling Sys Potentially Inoperable Following SSE Due to Failure of Non Seismic Connecting Piping (← links)
- 05000423/LER-1997-001, Submits Commitments Re LER 97-001-00,documenting Condition Determined at Plant on 970104 (← links)
- 05000423/LER-1996-051, Forwards LER 96-051-00 & Util Commitments in Response to Event (← links)
- 05000423/LER-1996-046, Fowards LER 96-046-00.Licensee Commitments Listed,Including Containment Fuel Drop Radiation Monitor Design Reviewed & TS Change Request Will Be Submitted to NRC for Approval (← links)
- 05000423/LER-1996-035, Forwards LER 96-035-00.MOV Calculations Will Be Revised Based on Bounding Application Factor/Pullout Efficiency or MOV Specific Performance Characteristics Prior to start-up from Current Outage (← links)
- 05000423/LER-1996-032, Forwards LER 96-032-00 Re 960909 Event.Listed Commitments Will Be Completed Including Performance of Hydrostatic Test of Sih Relief Valves (← links)
- 05000423/LER-1997-021, Provides Clarification of Actions Taken in Completing Commitment Previously Submitted in LER 97-021-00, Defective Design of RSS Expansion Joint Tie Rod Assembly (← links)
- 05000423/LER-1997-030, Provides Revised Schedule for Submittal of LAR as Identified in LER 97-030-00.LAR Was Previously Scheduled to Be Submitted on 970801 & Is Currently Scheduled to Be Submitted by 970831.W/revised Commitments (← links)
- 05000423/LER-1999-006, Forwards LER 99-006-00,re Failure of Both Reactor Plant Aerated Drains SR Air Driven Sump Pumps During Technical Requirements Manual Surveillance on 990516.Commitments Also Encl (← links)
- 05000423/LER-1999-005, Forwards LER 99-005-00,re Failure to Perform Surveillance on RCS Pressurizer Heater Penetration Breakers,Determined Reportable on 990510.Commitments Made,Encl (← links)
- 05000423/LER-1998-001, Forwards LER 98-001-00,documenting Condition Determined Reportable at Millstone,Unit 3,on 980106.Commitments Made by Util,Encl (← links)
- 05000423/LER-1998-009, Forwards Revised Commitments Contained in LER 98-009-00 for Mnps,Unit 3, Containment Radiation Monitor CMS*22 Setpoints Non-Conservative W/Respect to Conforming W/Commitments Made to Reg Guide 1.45 within Fsar (← links)
- 05000423/LER-1997-043, Forwards LER 97-043-00,documenting Condition Determined Reportable on 970630.List of Commitments Provided (← links)
- 05000423/LER-1998-002, Informs of Revised Completion Date to Complete Commitment Contained in LER 98-002-00, Verification of ECCS Piping Full of Water Per TS 4.5.2.b.1 Not Being Met. New Commitment Made by Util,Encl (← links)
- 05000423/LER-1992-005, Discusses Omission of RCS Depressurization Function from TS Requirements for Remote Shutdown Capability,Per LER 92-005 Submitted Via .Caused by Administrative Oversight.Ts Change Will Be Processed & Valves Tested (← links)
- 05000423/LER-2024-001, Loss of Safety Function and Condition Prohibited by Technical Specifications for Loss of Secondary Containment Boundary (← links)
- 05000423/LER-2023-006-02, Pressurizer Power Operated Relief Valve Failed to Open During Surveillance Testing Resulting in a Condition Prohibited by Technical Specifications (← links)
- 05000423/LER-2023-006-01, Pressurizer Power Operated Relief Valve Failed to Open During Surveillance Testing Resulting in a Condition Prohibited by Technical Specifications (← links)
- 05000423/LER-2023-006, Pressurizer Power Operated Relief Valve Failed to Stroke Open During Surveillance Testing Resulting in a Condition Prohibited by Technical Specifications (← links)
- 05000423/LER-2023-005, Oil Leakage from C RSS Pump Motor Challenged Meeting Its Mission Time Resulting in a Condition Prohibited by Technical Specifications (← links)
- 05000423/LER-2023-004, For Millstone Power Station, Unit 3 Regarding Reactor Coolant System Pressure Isolation Valves Operational Leakage Exceeded the Acceptance Criteria Resulting in a Condition Prohibited by Technical Specifications (← links)
- 05000423/LER-2023-003, RCS Temperature Detector Exceeded Time Response Acceptance Criteria Resulting in a Condition Prohibited by Technical Specifications (← links)
- 05000423/LER-2023-002, Auxiliary Feedwater Control Valve Failure Resulting in a Condition Prohibited by Technical Specifications (← links)
- 05000423/LER-2023-001, Automatic Reactor Trip Due to Main Generator Output Breaker Ground Fault (← links)
- 05000423/LER-2022-002, Two Main Steam Safety Valves Installed in Wring Location Resulting in Failure to Lift within the Technical Specification Acceptance Criteria (← links)
- 05000423/LER-2022-001, Emergency Core Cooling and Reactor Plant Component Cooling Water Systems Inoperable for Time Greater than Allowed by Technical Specifications (← links)
- 05000423/LER-2020-005, Loss of Safety Function - Secondary Containment (← links)
- 05000423/LER-1998-031, :on 980519,incomplete Testing of P-4 Interlock Function Was Noted.Caused by Human Error & Inadequate Procedure Development.Revised Procedure, Ssps Refueling Tests (← links)
- 05000423/LER-1997-054, :on 971029,noted That W Fuel May Exceed 10CFR50.46 Max Cladding Oxidation Design Criteria.Caused by Potentially non-conservative Modeling Criteria/Assumptions. Plant Specific Evaluation Has Been Performed by W (← links)
- 05000423/LER-1997-054-01, Forwards LER 97-054-01,re Event Which Occurred at Millstone Unit 3 on 971029.Commitments Made within Ltr,Encl (← links)
- 05000423/LER-1998-030, :on 980515,noted That Channel Calibr of Hydrogen Recombiners Did Not Meet Requirements of SR 4.6.4.2.b.Caused by Deficient Initial or Subsequent Reviews. Modified Hydrogen Recombiner Channel Calibr Procedures (← links)
- 05000423/LER-1998-028, :on 980513,failure to Perform Leak Rate Testing at Increased Frequency for PIV 3RHS-MV8702B Was Noted.Caused by Inadequate Program Monitoring.No Immediate Corrective Actions Were Required (← links)
- 05000423/LER-1996-021, :on 960628,components Not Included in IST Program as Result of Programmatic Deficiencies,Was Discovered.Caused by Inadequate Mgt Commitment.Existing IST Documents & Procedures Will Be Reviewed & Revised (← links)
- 05000423/LER-1996-021-02, Forwards LER 96-021-02 Re Components Not Included in IST Program as Result of Programmatic Deficiencies.Status of NNECO Commitments from Previous LER Suppl Are Contained in Attachment 1.Addl Commitments Contained in Attachme (← links)
- 05000423/LER-1998-029, :on 980514,supplementary Collection & Release Sys Bypass Leakage May Result in Unaccounted CR & TSC Doses,Was Identified.Caused by Inadequate Technical Review.Revised Dose Calculations (← links)
- 05000423/LER-1997-063, :on 971231,inadequate Operator Response Time for Inadvertent SI Event Was Noted.Caused by Conflicting Program Requirements.Porvs & Associated Downstream Piping Have Been Qualified for Water Relief (← links)
- 05000423/LER-1997-063-01, Forwards LER 97-063-01,re Event Determined Reportable at Millstone Unit 3 on 971231.Commitments Made within Ltr,Encl (← links)
- 05000423/LER-1989-020, :on 890830,potential Security Barrier Breach Discovered Via 8 Inch Main Steam Sys Pipe Opening.Caused by Inadequate Administrative Control to Identify Breaches. Supplementary Leak Collection Sys Restored (← links)
- 05000423/LER-1989-016, :on 890703,discovered That Required Fire Detection Surveillance for Control Bldg Hvac,Chiller & Computer Rooms Not Completed within Required Frequency. Caused by Personnel Error.Fire Watch Initiated (← links)
- 05000423/LER-1998-025, :on 980427,failure to Perform TS Required Full Loop Channel Calibr of Meteorological Monitoring Instrumentation Was Noted.Caused by Poor Mgt Support. Prepared site-wide Procedure (← links)
- 05000423/LER-1989-004-01, :on 890216,shift Supervisor Observed That Fire Detection in 3 Ft 8 Inch & 24 F 6 Inch Elevations of Containment Bldg Inoperable for 10 H.Caused by Personnel Error.Hourly Fire Watch Established (← links)
- 05000423/LER-1998-016, :on 980223,potential Air/Gas Intrusion in Chemical & Volume Control Sys Was Noted.Caused by Inadequate Initial Design.No Cause for Corrective Actions Because Both Flow Paths Were Operable (← links)
- 05000423/LER-1998-016-01, Forwards LER 98-016-01,determined Reportable at Millstone Unit 3 on 980223,per 10CFR50.73(a)(2)(vii).Commitments Made within Ltr,Encl (← links)
- 05000423/LER-1997-060, :on 971209,ineffective Implementation of PASS Program Was Noted.Caused by Failure of Mgt to Implement Effective PASS Program That Ensured Compliance W/Ts.Pass Has Been Incorporated Into Millstone Maint Rule as (a)(1) Sys (← links)
- 05000423/LER-1997-060-01, Forwards LER 97-060-01,determined Reportable at Millstone Unit 3 on 971209,per 10CFR50.73(a)(2)(i)(B).Commitments Made within Ltr,Encl (← links)
- 05000423/LER-1989-015-01, :on 890622,plant line-up Was Not Per Tech Spec 3.8.3.2 & on 890620,emergency Diesel Generator B Was Removed from Svc Due to Failed Surveillance Test.Caused by Personnel Error.Operating Procedures Revised (← links)
- 05000423/LER-1989-006, :on 890224,found That Surveillance Procedure in Error & Did Not Identify Six Addl Smoke Detectors.Caused by Administrative Error.Surveillance Procedure Updated to Comply W/Final Sys Design & Tech Specs (← links)
- 05000423/LER-1998-022, :on 980408,failure to Provide Operable Reactor Coolant Sys Loops in Mode 4 Occurred.Caused by Human Error. Operations Personnel Involved in Event Have Been Counseled (← links)
- 05000423/LER-1998-023, :on 980411,ESF Actuation Occurred at Millstone Unit 3.Caused by Failure of CR Operations Personnel to Diagnose S/G C Level Loss Resulting from Abnormal Sampling Blowdown Lineup.Operating Procedure Revised (← links)
- 05000423/LER-1998-024, :on 980409,failed to Complete Action Statement Associated W/Ts 4/3.3.1 within Required Time Period.Caused by Human Error.Counseled Appropriate Shift Personnel on Efficient Time Mgt Associated W/Active TS LCO Requirements (← links)
- 05000423/LER-1989-004, :on 890216,fire Detection Discovered Inoperable Approx for 10 H.Caused by Personnel Error.Fire Watch Established.All on-shift Personnel Briefed Re Importance of Prompt Evaluation & Response to Fire Alarms (← links)
- 05000423/LER-1989-005, :on 890217,inadvertent Safety Injection Occurred on Train B.Caused by Personnel Error.All Operators Counseled on Importance of Being Cognizant of Actions When Manipulating Equipment (← links)
- 05000423/LER-1989-018, :on 890802,condensate Demineralizer Waste Neutralization Sump Effluent Radiation Monitor Declared Inoperable Due to Inadequate Testing.Caused by Personnel Error.Interlocks Included in Procedures (← links)
- 05000423/LER-1989-019, :on 890804,discovered That Isolation Valve for Fire Protection Hose House 3 in Closed Position,Rendering Hose House Inoperable.Caused by Administrative Deficiency. Valve Restored & Instruction Revised (← links)
- 05000423/LER-1989-014, :on 890614,control Bldg Isolation Actuation Occurred.Caused by Procedural Inadequacy While Performing Refueling Surveillance of Reactor Protection Sys. Surveillance Procedure Revised (← links)
- 05000423/LER-1989-012, :on 890605 & 15,during Performance of Local Leak Rate Testing,Specific Piping Penetrations Could Not Be Pressurized to Test Pressure.Caused by Swing Check Valve Not Being Fully Seated Prior to Test.Valve Removed (← links)
- 05000423/LER-1989-013-01, :on 890608,Train a Loss of Power Signal Initiated from Emergency Diesel Generator a Panel.Caused by Replacement of Control Power Fuse in Train a Undervoltage Auxiliary Circuit.Personnel Counseled (← links)
- 05000423/LER-1989-007, :on 890403,control Bldg Ventilation Not Placed in Filtered Recirculation.Caused by Personnel Error. Operations Policy Revised to Require Compensatory Action.W/ (← links)
- 05000423/LER-1989-017, :on 890718,motor-operated Isolation Valve for Containment Recirculation Spray Header Inoperable for 27 H. on 890717,dual Position Indication Observed in Control Board.Caused by Inadequate Guidance (← links)
- 05000423/LER-1989-011-01, :on 890527 & 0603,as-found Local Leak Rate Testing Containment Unfiltered Leakage Exceeded Tech Spec Limit.Caused by Poor wedge-to-seat Fit.Wedge Angle Changed & Valve Seats Resurfaced to Ensure Proper Seal (← links)
- 05000423/LER-1988-016, :on 880425,control Switches for Both Trains of Motor Driven Auxiliary Feedwater Pumps & Train a Fan Left in pull-to-lock During Change Mode.Caused by Personnel Error. Tech Spec Reviewed to Ensure Operability (← links)
- 05000423/LER-1989-009, :on 890511,reactor Trip Occurred Causing Control Rods to Unlatch.Caused by Procedural Inadequacy. Procedures Changed to Require Rods to Be Unlatched Before Connecting Rod Drop Time Recording (← links)
- 05000423/LER-1989-010-01, :on 890512,setpoint Drift Identified While Testing Main Steam Safety Valves.Cause Unknown.Setpoints on Valves Reset to Tech Spec Requirements (← links)
- 05000423/LER-1989-008, :on 890506,manual Reactor Trip Initiated Due to Anticipated Turbine Trip.Caused by Design Deficiency in That Traveling Screen Capacity Was Inadequate.Procedure Change Implemented (← links)
- 05000423/LER-1998-012, :on 980218,potential Failure of Rhrps Due to Loss of Mim Flow Protection,Was Reported.Caused by Lack of Documented Review & Analysis of Historical Design Deficiency.Performed DCR M3-98013 (← links)
- 05000423/LER-1998-012-01, Forwards LER 98-012-01,documenting Addl Info Pertaining to Condition That Was Determined Reportable on 980218. Attachment 1 Contains Commitments in Response to Event (← links)
- 05000423/LER-1987-044, :on 871120,surveillance Interval for Channel Calibr of Ventilation Vent Stack Radiation Monitor Exceeded. Caused by Personnel Error.Administrative Procedures Established Re Rescheduling of Surveillances (← links)
- 05000423/LER-1987-046, :on 871124 & 27,auxiliary Sample Rig Action Surveillances Missed.Caused by Isolation of Auxiliary Sample Rig Due to Improper Manual Valve Lineup & Personnel Error. Flow Through Rig Verified Every 4 H (← links)
- 05000423/LER-1987-045, :on 871121,emergency Diesel Generator Fuel Oil Analysis for Kinematic Viscosity Before Addition to Storage Tanks Missed.Caused by Incorrect Acceptance Criteria Comparison Between Two Forms.Forms Updated (← links)
- 05000423/LER-1987-041-01, :on 871116,discovered That 480 & 120 Volt Ac Circuit Breakers Not Tested in Accordance W/Tech Spec 4.8.4.1(a)(2).Caused by Failure to Perform Prelicensing Review (← links)
- 05000423/LER-1987-043-01, :on 871118,as-found Leakage on Valve 3CDS*CTV91B Exceeded Tech Spec 3.6.1.2.C.Caused by Improper Installation of Valve Seating surface.T-ring Replaced & Rev of Maint Procedures & Training Program Planned (← links)
- 05000423/LER-1987-042-01, :on 871117,Tech Spec Surveillance Requiring Measuring Detector Plateau Curve for Each intermediate-range & power-range Neutron Detector Not Performed.Caused by Procedural Inadequacy.New Procedure Written (← links)
- 05000423/LER-1987-040-01, :on 871109,fire Protection Water Valve Lineup Surveillance Not Performed.Caused by Human Error.Supervisors Received Written Notice Reemphasizing Attention to Detail Re Schedule (← links)
- 05000423/LER-1987-039-01, :on 871111,emergency Diesel Generator Fuel Oil Tanks Were Not Sampled for Particulate.Caused by Improper Scheduling & Delivering Samples to Chemistry W/O Obtaining Formal Receipt.Procedures Revised (← links)
- 05000423/LER-1998-036, :on 980710,ESF Building Sump Pump Design Deficiencies Were Noted.Caused by Lack of Appropriate Level of Project Mgt Attention.Corrected Design Deficiencies (← links)
- 05000423/LER-1996-004-01, :on 960319,determined That Auxiliary Feedwater Isolation Valves Were in Noncompliance W/Ts.Caused by Misinterpretation of Ts.Revised Operating Procedure to Preclude cross-connected Sys Alignment (← links)
- 05000423/LER-1987-037-01, :on 871101,feedwater Isolation Occurred Due to High Steam Generator Level.Caused by Operator Error.Steam Generator Level Allowed to Decrease to Normal Operating Range.Feedwater Reset & Placed in Svc (← links)
- 05000423/LER-1987-038-01, :on 871110,loss of 4.16 Kv Vital Bus Occurred Due to Mechanical Shock.Caused by Broom Handle Impacting Switchgear Door in Close Proximity to Relay.Warning Signs & Tape Returned to Position (← links)
- 05000423/LER-1987-036-01, :on 871031,setpoint Drift on Main Steam Safety Valves Discovered.Cause Unknown.Valves Reset to Tech Spec Requirements.Untested Valves Will Be Tested or Replaced Prior to Resuming Power Operations (← links)
- 05000423/LER-1998-032, :on 980618,missed Fuel Handling Crane Limit Switch Surveillance Test Performance Was Noted.Caused by Human Error.Worker Was Coached on Need to Validate Performance of Surveillances Called Out in OPS Forms (← links)
- 05000423/LER-1987-035-01, :on 871016,discrepancy Between Plant Tech Spec (TS) Surveillance Method Specified & Actual Method Used for Biannual Procedure Review Discovered.Caused by Administrative Error.Ts Surveillance Updated (← links)
- 05000423/LER-1998-035, :on 980612,service Water Pump Cubicle Temperature Could Exceed Design Basis,Was Determined.Caused by Inadequate Design Control Process During Initial Plant Design.Reviewed & Revised Design Basis Calculations (← links)
- 05000423/LER-1998-034, :on 980614,manual Reactor Trip Initiated in Response to Malfunction of Control Rod Group Demand Position Indication Counters.Caused by Human Error.Control Rod Group Step Counters Modified to Correct Condition (← links)
- 05000423/LER-1998-033, :on 980610,manual ESF Actuation of Motor Driven Auxiliary FW Pumps Was Noted.Caused by Trip of Motor Driven SG FW Pump.Motor Driven FW Pump Impeller Was Replaced (← links)
- 05000423/LER-1987-032, :on 870706,Tech Specs Violated When Fire Watches Not Posted Due to Inadvertent Discharge of CO2 Fire Suppression Sys in East Motor Control Ctr/Rod Control Area. Caused by Deficient Procedure (← links)
- 05000423/LER-1998-027, :on 980416,determined That Unmonitored Flowpaths Existed for Diesel Fuel Oil Transfer Pumps During IST Testing.Caused by Program & Process Re Deficiencies. Review of Past Surveillance Results Conducted (← links)
- 05000423/LER-1998-026, :on 980424,noted That Analyzed SGTR Thyroid Dose Contained non-conservative Assumption.Caused by Inadequate Review by Individual.Will Revise SGTR Offsite Dose Analysis to Reflect Mass Release Analysis (← links)
- 05000423/LER-1989-003-01, :on 890207,unidentified Temporary Sealed Fire Penetration Discovered Between Trains a & B on Containment Recirculation Spray Sys Cubicles in ESF Bldg.Caused by Personnel Error.Fire Watch Established (← links)
- 05000423/LER-1987-034-01, :on 870923,during Full Power in Mode 1,reactor Trip Occurred Due to Lo Lo Steam Generator Level.Caused by Failure of Solenoid Valve Which Controls Hydraulic Oil Flow to Isolation Valve.Solenoid Replaced (← links)
- 05000423/LER-1988-026, :on 881118,discovered That Certain Circumstances Could Lead to Facility Becoming Isolated from Plant Switchyard While on-line.Caused by Inadequate Plant Design.Mod Planned for Next Refueling Outage (← links)
- 05000423/LER-1987-028, :on 870606,control Bldg Isolation Signals Received.Caused by Failure of Chlorine Detector Due to Pollen & Dust on Sensing Probe.Sensing Element of Detector Replaced & Detector Returned to Svc (← links)
- 05000423/LER-1987-029, :on 870607 & 24,fire Watches Not Properly Established in Areas W/Fire Suppression Sys Removed from Svc.Caused by Operator Error.Fire Suppression Sys Returned to Operation & Procedure Revised (← links)
- 05000423/LER-1987-027, :on 870605,reactor Tripped on lo-lo Steam Generator Level Due to Loss of Vital a Bus 34C.Caused by Personnel Error.Personnel Directed Not to Perform Any Action in Vicinity of Switchgear Cubicles (← links)
- 05000423/LER-1987-047, :on 871130,core Alteration Made W/O Licensed Senior Reactor Operator Present in Containment.Caused by Both Personnel & Procedural Errors.Core Alterations Stopped Until Senior Reactor Operator Could Be Present (← links)
- 05000423/LER-1987-048, :on 871203 & 05,drain Hoses Discovered Strung Through Train B Recirculation Spray Sys Cubicle & Control Bldg Equipment Room Door,Respectively.Caused by Human Error. Memo to Reinforce Correct Methods Issued (← links)
- 05000423/LER-1987-030, :on 870608,inadvertent Mode Change from Cold to Hot Shutdown Occurred.Caused by Operator Error.Operators Counseled & Operator Involved Temporarily Relieved of Licensed Duties (← links)
- 05000423/LER-1987-033-01, :on 870814 & 22,refueling Water Storage Tank Level Below Tech Spec Min Requirement.Caused by Incorrect Assumption Made During Initial Calibr Due to Personnel Error.Procedures Revised (← links)
- 05000423/LER-1998-018, :on 980302,TS LCO Action Not Completed within Specified Time Limit,Was Identified.Caused by Inadequate Administrative Controls.Written Expectations Re Conservative Philosophy When Scheduling or Performing LCO Surveillance (← links)
- 05000423/LER-1998-007, :on 980129,containment Bypass Leakage Was in Excess of TS Limits.Caused by non-conservative Decision Making (W/Respect to NRC Branch Technical Position). Calculation Review & Approval Has Been Improved (← links)
- 05000423/LER-1998-017, :on 980227,3SIL*V15 Testing Was Contrary to TS 4.0.5 Requirements.Caused by Program & Process Deficiencies. Submittal of Relief Request to Allow Extension of Disassembly & Insp Interval for 3SIL*V15 Was Submitted (← links)
- 05000423/LER-1997-044, :on 970701,missed TS Surveillance of ESFAS Purge Isolation Instrumentation Occurred.Cause of Missed TS Surveillance Was Not Including Condition Surveillance Triggering Mechanisms in Cooldown.Ts Change Prepared (← links)
- 05000423/LER-1997-034, LER 970934-01:on 970918,RHR Pump Suction Relief Valve Setpoint Not IAW TS Was Determined.Caused by Insufficient Configuration Control.Declared B Train RHR Valve Inoperable, Recalibrated to Correct Setpoint & Declared Operable (← links)
- 05000423/LER-1997-034-01, Forwards LER 97-034-01,documenting Condition That Was Determined at Millstone,Unit 3 on 970918.Attachment 1 to Ltr Contains Commitments in Response to Event (← links)
- 05000423/LER-1998-014, :on 980220,failure to Provide Weepholes in Conduits & Junction Boxes Was Identified.Caused by Inadequate Review & Process Control.Conducted Walkdowns & Provided Weepholes to 227 Individual Components (← links)
- 05000423/LER-1998-015, :on 980221,historical Failure to Enter Tech Specs for Manual Control of Automatic Safety Function Occurred.Caused by Misjudgment in Applying Use of Dedicated Operator Function.Procedures Will Be Reviewed & Revised (← links)
- 05000423/LER-1998-013, :on 980219,determined That TS Required Sampling During Mode 5 Had Not Been Completed for SG Drain Down Due to Less than Adequate Communications Between Operations & Chemistry.Reinforced Applicability of TS Requirements (← links)
- 05000423/LER-1998-006, Forwards LER 98-006-00,documenting Condition Determined Reportable at Unit 3 on 980115.Util Commitments in Response to Event Contained within Attachment 1 to Ltr (← links)
- 05000423/LER-1998-021, :on 980318,discovered That Several Manual Valves & Check Valve Tests Were Not Included in IST Program. Caused by Lack of Clear Documentation.Satisfactorily Tested & Included Reported Valves in IST Program (← links)
- 05000423/LER-1998-010, :on 980211,failed to Meet TS Definition of Analog Channel Operational Test of Unit 1 Main Stack Noble Gas Activity Monitor.Caused by Inadequate Verification of Compliance W/Unit 3 Ts.Procedures Will Be Revised (← links)
- 05000423/LER-1998-011, :on 980218,failed to Adequately Test Turbine Driven Auxiliary Feedwater Pump.Caused by Inadequate Interface Among Organization.Tdafw Pump Will Be Tested (← links)
- 05000423/LER-1998-019, :on 980313,documented Max Required Accident Condition Flow Through Check Valves within Inservice Test Program Versus Results of Surveillance Testing.Cauesd by Program & Process Related Deficiencies.Procedures Revised (← links)
- 05000423/LER-1998-020, :on 980320,identified That Daily Channel Check of Radioactive Liquid Effluent Waste Neutralization Sump Monitor Had Not Been Performed.Caused by Poorly Written Procedure.Revised Implementation Documents (← links)
- 05000423/LER-1997-048, :on 970806,oversized Primary Grade Water Sys Pump Impeller Could Result in Boron Dilution Event Was Determined.Caused by Insufficient Configuration Control in Design Program.Valves Administratively Locked Closed (← links)
- 05000423/LER-1998-008, :on 980210,RS Sys Historically Outside of Design Basis as Result of Design Change.Caused by Inadequate Historical SE Program Design When Compared W/Current Standards.Lar Was Prepared & Submitted on 980303 (← links)
- 05000423/LER-1998-007-01, Forwards LER 98-007-01,documenting Condition That Was Orginally Determined at Millstone,Unit 3 on 980129.LER Being Submitted Pursuant to 10CFR50.73(a)(2)(i)(B).NNECO Commitments Contained within Attachment 1 to Ltr (← links)
- 05000423/LER-1987-019, :on 870411,temp of Turbine Driven Auxiliary Feedwater Pump Area ES-07 Exceeded 110 F Limit Set by Tech Specs 3.714b & 6.9.2.Cause Not Stated.Equipment Not Affected According to Maint & Inservice Insp (← links)
- 05000423/LER-1987-018, :on 870402,train a Control Bldg Inlet Radiation Monitor Not in Service as Required by Tech Spec.Caused by Personnel Error.Channel Check Surveillance Procedures on safety-related Radiation Monitors Revised (← links)
- 05000423/LER-1986-051, :on 860906,reactor Trip Occurred Due to Low Steam Generator Level.Caused by Failure of Feedwater Isolation Valve.Intermittent Opening in Local Portion of Circuit Will Be Checked During Next Shutdown (← links)
- 05000423/LER-1987-026, :on 870514,reactor Trip Occurred Due to Opening of Train B Reactor Trip Breaker.Caused by Spurious Trip. Loose Shield Tightened & All Sys Associated W/Trip Inspected & Tested (← links)
- 05000423/LER-1986-055, :on 861106,emergency Diesel Generator B Did Not Start within Required 10 During Surveillance Testing. Caused by Low Lube Oil & Jacket Water Temp.Another Start Performed After Lube Oil & Temps Increased (← links)
- 05000423/LER-1987-025, :on 870507,reactor Trip Occurred Due to lo-lo Steam Generator Level.Caused by Procedural Inadequacy. Pressure Re Alarm Response to High Bearing Revised (← links)
- 05000423/LER-1987-024, :on 870506,Train B Emergency Diesel Generator (EDG) Failed During Surveillance Testing Due to Air Start Solenoid Valve Failure & Train B EDG Tripped Due to High Crankcase Pressure.Procedures Revised (← links)
- 05000423/LER-1986-054, :on 861030,fire Watch Not Established in Reactor Containment within Allotted Time.Caused by Difficulty of Achieving Containment Entry within 1 H.Tech Spec Change Request Will Be Submitted (← links)
- 05000423/LER-1987-022, :on 870415,results of Steam Generator Condensate Pot Temp Monitoring Indicated Error in Steam Generator Level.Caused by Design Configuration of Generator Ref Legs.Improved Design Will Be Installed (← links)
- 05000423/LER-1987-021, :on 870412,reactor Trip Occurred Due to lo-lo Steam Generator Level Following Feedwater Isolation Signal. Caused by Operator Error.Revised Procedures Issued.All Licensed Operators Counseled (← links)
- 05000423/LER-1987-020, :on 870412,reactor Trip Occurred Due to Lo Lo Steam Level in Steam Generator D.Caused by Equipment Failure.Air Supply Line Repaired & Retested Satisfactorily (← links)
- 05000423/LER-1986-053, :on 861015,protective & Control Sys Setpoints for intermediate-range Nuclear Power Detectors Determined in Excess of Specified Limits.Caused by Defective Procedure. Setpoints Recalculated.Circuitry Recalibr (← links)
- 05000423/LER-1986-044, :on 860731,liquid Discharge Valve Bypassed W/O Required Double Valve Lineup Verification.Caused by Operator Error.Personnel Counseled in Requirements for Alternate Effluent Discharge Procedures (← links)
- 05000423/LER-1987-005, :on 870201,control Room Envelope Pressurization Surveillance Failed Due to Mispositioned Throttle Valve. Caused by Personnel Error.Procedure Implemented to Establish Correct Valve Position (← links)
- 05000423/LER-1986-059, :on 861227,plant Equipment Operator Discovered Three Unsealed Penetrations in Auxiliary Bldg Wall.Caused by Failure to Identify Items During as-built Walkdown.Visual Exam Conducted of All Wall Areas (← links)
- 05000423/LER-1986-057, ;on 861216,reactor Trip Setpoints Associated W/ Low Flow Trip Determined Incorrect Due to Incorrect Calculation of RCS Flowrate.Caused by Failure to Transmit Correct Temp Detector Charts.Procedure Revised (← links)
- 05000423/LER-1987-004, :on 870127 Motor Driven Auxiliary Feedwater Pump Train a Tripped.Cause Not Determined.Train B Tripped on 870129 During Surveillance Testing.Caused by Low Suction Pressure Trips.Trip Function Removed (← links)
- 05000423/LER-1987-006, :on 870201,shift Supervisor Discovered That Surveillance of Area Temp Monitoring in TN-02 Area Not Performed within Alloted Time Frame.Caused by Personnel Error.Personnel Reminded of Duties (← links)
- 05000423/LER-1997-049, :on 970910,water Was Inadvertently Added to RCS While Entered Into LCO Action Statement.Caused by Inadequate Verification & Validation of Sys Configuration Prior to Conducting Pump Test.Counseled Operations Shift Personnel (← links)
- 05000423/LER-1986-036, :on 860519,facility Operating Under Tech Spec 3.8.2.1.b Action Statement W/Battery Bank 301a-2 Inoperable Due to Unperformed Mod to Battery Charger.Seismic Bracing Designed & Installed on Battery Charger (← links)
- 05000423/LER-1986-052, :on 860918,during Mode 1,discovered That Surveillance of Fire Suppression Halon Bottles Missed.Caused by Administrative Error.Maint Dept Assumed Complete Responsibility for Halon Sys (← links)
- 05000423/LER-1987-001-02, :on 870113,plant Received Automatic Reactor Trip as Result of Automatic Turbine Trip.Caused by Inadequate Communications Between Operations Personnel. Operational Procedures Updated (← links)
- 05000423/LER-1987-003, :on 870114 & 0205,Train B Emergency Diesel Generator Did Not Start within Required 10 During Surveillance Testing.Caused by Inadequate Purge of Air from Fuel Injectors & Low Oil Temp.Maint Performed (← links)
- 05000423/LER-1997-047, :on 970815,identified That Testing Performed Was Not Adequate & Condition Reportable.Caused by Inadequate Initial Development of Applicable Surveillance Test Procedures.Surveillance Testing Procedures Will Be Revised (← links)
- 05000423/LER-1987-002-01, :on 870114,reactor Trip Occurred When Reactor Operator Accidently Reset Source Range High Flux Reactor Trip Block.Caused by Operator Error Compounded by Sensitive Switch.Extenders Removed & Caution Tags Added (← links)
- 05000423/LER-1986-029, :on 860329,turbine-driven Auxiliary Feedwater Pump Exceeded Temp Limit of 110 F by 11.2 F.Caused by Failure of Air Conditioning Unit.Equipment Repaired & Temp Under Limit within 12 H of Incident (← links)
- 05000423/LER-1997-046, :on 970523,determined That Situation Could Result in Loss of Both Trains of Rs Sys.Caused by Design Deficiency.Design Mod Implemented to Address Rs Sys (← links)
- 05000423/LER-1997-040, :on 970627,quarterly IST Closure Testing of SW Sys Check Valves 3SWP* 705,706,707 & 708 Were Not Performed. Caused by Programmatic or Managerial Deficiency.Performed Review of IST Program (← links)
- 05000423/LER-1996-036-02, Forwards LER 96-036-02,documenting Condition Originally Identified on 960926.List of Commitments Provided (← links)
- 05000423/LER-1997-042, :on 970701,RC Dilution Isolation Valves Were Inoperable Due to Not Being Included in IST Program Which Resulted in Inoperability of Emergency Boration Sys.Revised IST Program Plan & Surveillance Test Procedures (← links)
- 05000423/LER-1986-021, :on 860301,safety Injection Occurred.Caused When Operator Failed to Assure Steam Generator Atmospheric Dump Valve Controller Output at Zero Prior to Resetting Steam Line Isolation Signal.Incident Reviewed (← links)
- 05000423/LER-1986-019, :on 860228,safety Injection Occurred.Caused When Operator Raised RCS Pressure to Reset P-11 Interlock While Steam Generator Pressure Less than Rate Compensated on Low Steam Line Pressure Actuation Setpoint (← links)
- 05000423/LER-1997-045, :on 970616,identified Discrepancy Between FSAR & TS Definitions of Reactor Trip Sys Response Time.Caused by Mgt Expectations & Guidance Re Literal Compliance W/Ts Neither Clear Nor Adequately Communicated.Testing Changed (← links)
- 05000423/LER-1987-017, :on 870329,while Performing Response Time Testing Per Tech Spec 4.3.2.2,several Components Failed to Meet Emergency Safeguards Features Actuation Sys Response Times.Caused by Inadequate Procedures (← links)
- 05000423/LER-1987-015, :on 870324,main Steam Isolation Trip Valves Did Not Meet 5 Closure Time Requirement.Caused by Procedure Deficiency.Valves Will Be Placed in Closed Position During Mode 4 Operation (← links)
- 05000423/LER-1986-045, :on 860731,containment Local Leak Rates May Have Exceeded Tech Specs 3.6.1.b & 3.6.1.2.c Limits.Caused by Damaged Chilled Water Sys Train a & B Supply Valves. Valves Repaired (← links)
- 05000423/LER-1987-007, :on 870211,plant Tech Spec Surveillance Requirement for Containment Drain Sump Inventory & Discharge Monitoring at Least Once Every 12 H Missed.Caused by Operator Error.New Policy Initiated (← links)
- 05000423/LER-1988-022, :on 880913 & 14,discovered That Hourly Fire Watch Patrol Initiated for Wrong Fire Door.Caused by Inadequate Identification of Fire Boundary Doors.Hourly Fire Watch Patrol Initiated on Subj Fire Door (← links)
- 05000423/LER-1986-039, :on 860625 & 29,control Bldg Isolation Signal Received from Control Bldg Ventilation Sys Air Duct Chlorine Detector.Caused by Accumulation of Dirt on Detector Probe. Probe Voltage Will Be Monitored Weekly (← links)
- 05000423/LER-1986-056, :on 861130,Train B Safety Injection Pump Cooler Svc Water Outlet Valve Found Closed Since 861126.Caused by Procedural Inadequacy & Personnel Error Due to Lack of Training.Procedure Discontinued (← links)
- 05000423/LER-1988-020, :on 880718,improper Bypass Breaker Surveillance Identified.Caused by Inadequate Administrative Review of Trip Actuating Device Operational Test Frequency Portion of Tech Specs.Review of Tech Specs Implemented (← links)
- 05000423/LER-1986-048, :on 860817,while in Mode 1 at 1190 Power, Reactor Trip Occurred When Steam Generator 3 Level Reached lo-lo Level Trip Setpoint.Caused by Operator Error.Steam Generator 3 Level Controller Regroomed (← links)
- 05000423/LER-1986-049, :on 860817,while in Mode 1,feedwater Isolation Signal Received When Steam Generator 3 Level Exceeded 82%. Reactor Trip Occurred When Steam Generator 4 Reached lo-lo Level Trip Setpoint.Caused by Operator Error (← links)
- 05000423/LER-1987-016, :on 870325,Train a Safety Injection Signal Received.Caused by Personnel Error Due to Defective Procedure.Applicable Procedure Changed to Properly Configure Protection Sys for Test (← links)
- 05000423/LER-1986-047, :on 860815,K1 Constant for Overtemp Delta T (OTDT) Not Set to Tech Specs.Caused by Administrative Error. Direct Reactor Trip Setpoints Verified & OTDT Channels Recalibr (← links)
- 05000423/LER-1987-011, :on 870319,voltage Relays Monitoring Train a & B Found W/Trip Setpoints Below Plant Tech Specs Allowable Setpoint.Caused by Setpoint Drift & Initial Setting Position.New Setpoints Allow for Drift (← links)
- 05000423/LER-1987-014, :on 870322,while in Cold Shutdown Mode 5,during Surveillance Testing,Train Emergency Diesel Generator B Failed to Start within 10 S.Caused by Buildup of Dirt/Rust in Main Air Start Valves.Valves Replaced (← links)
- 05000423/LER-1987-013, :on 870321,discovered 120-volt Ac Nonvital Circuit Entering Containment Did Not Have Secondary Penetration Conductor Overcurrent Protection.Caused by Personnel Error.Protection Installed & Tested (← links)
- 05000423/LER-1987-012, :on 870320,Tech Spec Surveillance on Snubber Visual Insp Missed.Caused by Engineering Oversight & Outdated Snubber List.List Updated & All Snubbers Inspected (← links)
- 05000423/LER-1986-046, :on 860801,during Mode 5,emergency Diesel Generator Train B Tripped During Surveillance Testing.Cause Unknown.Generator Restored to Svc (← links)
- 05000423/LER-1986-040, :on 860721,Train B Control Bldg Isolation Signals Generated Due to Failures of Control Bldg Inlet Ventilation Chlorine Detectors.Caused by Presence of Contaminants on Probes.Detectors Relocated (← links)
- 05000423/LER-1986-041, :on 860724,reactor Trip Occurred Due to lo-lo Level in Steam Generator D.Caused by Feedwater Isolation. Limit Switches Adjusted and Positioners Recalibr.Plant Mod Planned to Replace Existing Positioners (← links)
- 05000423/LER-1986-042, :on 860725,Train a Safety Injection Actuation Occurred.Caused by Intermittent Resetting of Pressurizer Low Pressure Safety Injection Block.Switch Panel Lugs Adjusted (← links)
- 05000423/LER-1988-024, :on 881022,manual Reactor Trip Due to Imminent Turbine Trip Due to Low Condenser Vacuum.Caused by Environ Conditions.Mods to Travelling Screen Sys Trash Trough to Increase Debris Removal Capability Implemented (← links)
- 05000423/LER-1986-034, :on 860507,discovered That Surveillance of ESF Bldg Ventilation Radiation Monitor Sampler Flow Rate Monitor Not Included in Monitor Surveillance Procedures.Surveillance Procedures Revised (← links)
- 05000423/LER-1986-035, :on 860509,while at Approx 80% Reactor Power, Reactor Trip Signal Received from Manual Turbine Trip.Caused by Fouling of Intake Screens.Screen Wash Sys Placed in Svc (← links)
- 05000423/LER-1987-008, :on 870307,reactor Trip Occurred Due to lo-lo Steam Generator Level in Steam Generator D.Caused by Failure of Solenoid Valve.Solenoid Valve Replaced & Tested for Operability (← links)
- 05000423/LER-1986-006-01, :on 860125 & 27,integrity of Control Room Pressure Envelope Discovered Violated W/O Notification of Shift Supervisor.Caused by Deficiency in Identification of Penetrations on Authorized Work Orders (← links)
- 05000423/LER-1988-023, :on 881006,MSIV Closed During Performance of Partial Stroke Surveillance Test,Resulting in Reactor Trip Due to Low Level in Steam Generator.Caused by Procedural Inadequacy.Surveillance Procedure Changed (← links)
- 05000423/LER-1986-031, :on 860419,control Bldg Isolation Signal Received from Ventilation Sys Supply Air Duct Chlorine Detector.Caused by Nonperformance of Maint Procedure. Procedure Placed on Tech Spec Schedule (← links)
- 05000423/LER-1986-032, :on 860423,reactor Trip Signal Received from Low Steam Generator Water Level Condition.Caused by Operator Error in Manually Controlling Water Level.Addl Grooming Performed on Control Sys Frvbv (← links)
- 05000423/LER-1986-023, :on 860311,inappropriate Calibr Method Used & on 860312,monitors Calibr Nonconservatively.Caused by Defective Procedure.Calibr Methods for Radiation Monitors Reviewed & Four Monitors Recalibr (← links)
- 05000423/LER-1986-005, :on 860125,two Channels of Steam Generator a Steam Line Pressure Found to Have Failed High.Caused by Frozen Sensing Lines on Pressure Transmitters.Lines Thawed Out.Temporary Heat Tracing Placed on Lines (← links)
- 05000423/LER-1986-004, :on 860123,plant Went from Hot Standby Mode to Startup Mode Contrary to Tech Spec Action Statement.Caused by Operator Misinterpretation of Tech Specs.Event Reviewed W/Licensed Senior Operator (← links)
- 05000423/LER-1997-036-01, Forwards LER 97-036-01 Which Documents Conditions That Was Determined Reportable at Facility on 970605,per 10CFR50.73(a)(2)(i)(B) & 10CFR50.73(a)(2)(ii)(B).Commitments in Response to Event Also Encl (← links)
- 05000423/LER-1997-055, :on 971105,discovered No Area Temp Monitoring within B & D Pump Recirculation Spray Sys Cubicle.Caused by Area Temp Monitoring Element Mounted in Wrong Location.Will Relocate Area Temp Monitor 3ECS-TE098 & Performed Walkdown (← links)
- 05000423/LER-1997-056, :on 971107,SWS Drainage Following Containment Depressurization Actuation & Loss of Power Resulted in Condition Outside Design Basis.Caused by Design Deficiency in Sws.Design Mod Will Be Implemented Prior to Mode 4 (← links)
- 05000423/LER-1998-004, :on 980114,EDG Intercoolant Coolers Were Not Capable of Meeting Design Criteria.Caused by Inadequate Implementation of GL 89-13 Section II Testing.Diesels Operability in Modes 5 & 6 Was Documented Via CAP (← links)
- 05000423/LER-1998-005, :on 980116,AMSE Section XI Code Requirements Not Met in Scheduling & Performing Inspections of Pipe Supports or Welds Were Noted.Caused by Misinterpretation of Info.Isi Surveillance Procedure Was Revised (← links)
- 05000423/LER-1998-001-01, :on 980106,discovered Motor Pinion Gear Keys Sheared for Valve Actuators.Caused by Improper Installation of Key Matl That Was Weaker than Required for Function. Replaced Sheared Keys W/Stronger 4140 Matl (← links)
- 05000423/LER-1998-003, :on 980114,ISI Pressure Tests for Class 2 & 3 Sys Were Missed.Caused by Historical Program Interface Deficiencies.Procedure for Sys Pressure Tests Has Been Revised to Reflect Sys within Scope of ISI Program (← links)
- 05000423/LER-1986-022, :on 860308,while Operating at 30% Power,Two Independent Channels of Steam Generator a Steam Line Pressure Found Failed High Due to Frozen Sensing Lines on Pressure Transmitters.Heat Tracing Reinstalled (← links)
- 05000423/LER-1998-002-01, :on 980112,verification of ECCS Piping Full of Water Per TS 4.5.2.b.1 Was Not Being Met.Caused by Personnel Not Considering ECCS cross-tie Piping as Discharge Piping. Revised ECCS Venting Sp (← links)
- 05000423/LER-1997-062-01, Forwards LER 97-062-01,documenting Condition Determined Reportable at Millstone,Unit 2 on 971219.Commitments Made by Util,Encl (← links)
- 05000423/LER-1997-053, :on 971024,channel Check Surveillance Requirements Were Not in Compliance W/Ts.Caused by Inadequate Monitoring by Mgt of Surveillance Program. Procedures That Need to Require Channel Checks,Corrected (← links)
- 05000423/LER-1997-009-01, Forwards LER 97-009-01,documenting Condition Originally Determined Reportable at Unit 3 on 970123.Util Commitments in Response to Event Contained within Attachment 1 to Ltr (← links)
- 05000423/LER-1986-038, :on 860605,penetration Through Main Steam Valve Bldg Supplementary Leak Collection & Release Sys Pressure Boundary Found Open to Atmosphere.Caused by Removal of Seal for Cable in Nov 1985.Penetration Sealed (← links)
- 05000423/LER-1997-050, :on 971017,determined That non-environ Qualified Parts Installed in FWIVs During Previous FWIV Svc Overhauls.Caused by Program Deficiency.Fwivs Will Be Inspected & Unqualified Parts Will Be Replaced (← links)
- 05000423/LER-1997-052, :on 971014,deficienies Were Identified in Performance of Surveillances for PORV Instrumentation.Caused by Procedural Deficiency.Reveiw of B Train PORV Circuity Conducted for Similar Conditions (← links)
- 05000423/LER-1998-045, :on 981211,RT Occurred Due to MSIV Closure During Partial Stroke Testing Due to Solenoid Valve Failure. Solenoid Valve Actuators Matl Replaced with Matl Less Susceptible to Stress Corrosion Cracking (← links)
- 05000423/LER-1997-051, :on 971007,noted Design Deficiency for 4.16kV Feeder Fault Clearing Times.Caused by Inadequate Design Control Process During Implementation.Will Restore Electrical Protection Relaying Scheme for Individual 4.16kV (← links)
- 05000423/LER-1996-015-05, Forwards LER 96-015-05,documenting Event That Occurred at Plant,Unit 3 on 960610,per 10CFR50.73(a)(2)(ii)(B). Commitments Made within Ltr Submitted (← links)
- 05000423/LER-1997-061, :on 971218,determined That TS 6.8.4 Leakage Reduction Program Does Not Address All Leakage Paths.Caused by Failure to Assign Ownership for Implementation of Section 6.0 Programs.Will Test Potential Leak Paths (← links)
- 05000423/LER-1986-033, :on 860429,low Level Waste Tank Discharged W/Radiation Monitor Sample Pump Deenergized,Rendering Liquid Effluent Monitoring Instrumentation Inoperable.Caused by Operator Error (← links)
- 05000423/LER-1986-037, :on 860510 & 12,w/plant in Hot Standby,Control Bldg Isolation Signal Received from Ventilation Sys Supply Air Duct Chlorine Detector,Train A.Caused by Accumulation of Dirt on Sensing Element (← links)
- 05000423/LER-1998-044, :on 981111,manual Reactor Trip Initiated When Differential Pressure Between a & B CWS Condensers Measured Greater than 2 Inches Water Gauge.Caused by High Levels of Debris Impinging.Modified Procedures (← links)
- 05000423/LER-1997-059, :on 970910,error Was Identified in BTP 9.5-1 Compliance Rept During Preparation of Design Change to Upgrade Pilot Solenoid Valve Associated W/Af.Caused by Design Deficiency.Design Mod Implemented (← links)
- 05000423/LER-1997-058, :on 971122,inadequate TSs Surveillances of Ssps Was Noted.Caused by Inadequate Owner Review During Plant Constr.Ssps Test Procedures Will Be Revised to Include Addl Testing Steps (← links)
- 05000423/LER-1997-057, :on 971113, a EDG Was Declared Inoperable Due to Ventilation Alignment Prohibiting Tornado Recovery. Actuator for a Emergency Ventilation Sys Air Intake Damper Has Been Replaced W/Functional Actuator (← links)
- 05000423/LER-1996-034, :on 960918,RHR Pump Suction Relief Valve Setpoint Was Not IAW Ts.Caused by Insufficient Configuration Control within Design Control Program.Ts Change Was Implemented on 970710 That Revised Setpoint Value (← links)
- 05000423/LER-1996-034-02, Forwards LER 96-034-02,documenting Condition That Was Initially Determined Reportable at Millstone Unit 3 on 960918.Commitments Made in Response to Event Also Encl (← links)
- 05000423/LER-1986-030, :on 860410,while in Mode 1,reactor Trip Occurred Due to Level Deviation in Steam Generator C.Caused by Personnel Error in Synchronizing Turbine Generator. Instruction Provided (← links)
- 05000423/LER-1997-036, :on 970605,configuration Management Program FSAR Identified That Incorrect Stress Analysis Limits May Have Been Used in Design of Moderate Energy Fluid Sys Piping.Caused by Inadequate Communication.Cis Restored (← links)
- 05000423/LER-1988-006, :on 880130,determined That Only One Centrifugal Charging Pump Operable,In Violation of Tech Spec 3.5.2. Caused by Procedural Inadequacy,Compounded by Poor Communications.Heatup Procedure Revised (← links)
- 05000423/LER-1997-037, :on 970516,discovered That RHR Sys Testing During Transition to Mode 4 Incorrectly Used RHR One Hour out-of-service Allowance.Caused by Improper Interpretation Contained in Ts.Submitted TS Change Request (← links)
- 05000423/LER-1998-043, :on 981028,manual RT Was Noted.Caused by High Conductivity in Condensate Sys.Leaking Condenser Tube in C Waterbox Was Plugged (← links)
- 05000423/LER-1999-007-01, :on 990518,discharge Filter Associated with Crss Cubicle Sump Pump 3DAS-8A,was Determined to Be Contaminated.Caused by Back Leakage from Contaminated Drains Feeding Into ECCS Pump.Lines Modified.With (← links)
- 05000423/LER-1999-006-01, :on 990516,both Reactor Plant Aerated Drains SR Air Driven Sump Pumps Failed During TRM Surveillance.Caused by Inadequate Preventive Maint Program Design.Surveillance Procedure Sp 3635B.2 Will Be Conducted Monthly (← links)
- 05000423/LER-1999-004-01, :on 990516,ESFA of Numerous Plant Components on Restoration of a Train Sequencer Occurred.Caused by Inadequate Procedure Direction.Issued Brief to Operations Describing Inadvertent Sequencer LOP Event.With (← links)
- 05000423/LER-1998-042, :on 981020,identified That TS Definition of Analog Channel Operational Test Not Met.Caused by Inadequate Verification of Compliance of Surveillance Procedure with TS Definition.Procedures Revised (← links)
- 05000423/LER-1988-018, :on 880519,two Reportable Events Re Control Bldg Inlet Ventilation High Radiation Control Bldg Isolation Trip Setpoint Discovered.Caused by Administrative Error. Default Values Changed to Comply W/Tech Specs (← links)
- 05000423/LER-1987-050, :on 871221,discovered That Temps for Various Areas Housing safety-related & Environmentally Qualified Equipment Not within Tech Spec Limits.Caused by Personnel Error.Personnel Instructed (← links)
- 05000423/LER-1998-041, :on 981016,failed to Enter as for Inoperable SG Water Level Channel IAW Tss.Root Cause of Event Is Under Investigation.Failed Circuit Card Was Replaced on 981016 & P-14 Function Was Restored to Operable Status (← links)
- 05000423/LER-1998-040, :on 981017,entry Into TS 3.0.3 Occurred Due to Both Quench Spray Sys Pumps Being Placed in pull-to-lock Position.Caused by Human Error.Operator Involved in Event Removed from Shift & Disciplinary Action Taken (← links)
- 05000423/LER-1999-005-01, :on 990510,failure to Perform Surveillance on RCS Pressurizer Heater Penetration Breakers Was Noted.Caused by Lack of Mgt Support.Required Surveillance of Identified Ten Breakers Was Completed (← links)
- 05000423/LER-1999-003-01, :on 990505,identified That 18 Month EDG Surveillance Test for LOP with ESF Start Did Not Initiate Test.Caused by Inadequate Understanding of Regulatory Guidance. a & B EDG Returned to Status.With (← links)
- 05000423/LER-1986-017, :on 860213,while Operating at 15% Power,W/Main Turbine Generator off-line,plant Received Reactor Trip. Caused by General Warning Alarm Present in Both Trains of Solid State Protection Sys (← links)
- 05000423/LER-1998-039, :on 981001,TS 3.0.3 Entry Was Noted.Caused by F1 Blown Fuse Inside Vital AC Inverter 1 Due to Electrical Component Problem within Inverter.Replaced Six Circuit Boards (← links)
- 05000423/LER-1998-016-02, Forwards LER 98-016-02,re Condition Determined Reportable at Millstone Unit 3 on 980223.Commitments Made by Util,Encl (← links)
- 05000423/LER-1988-017, :on 880425,4 H Sample Flow Rate Estimate Not Performed Per Tech Spec 3.3.3.10.Caused by Personnel Error. Written Communications Between Depts Required When Directing Another Dept to Comply W/Tech Spec Action (← links)
- 05000423/LER-1998-038, :on 980915,manual Reactor Trip Was Initiated When Condensate Pump Discharge Conductivity Exceeded Limits Allowed by Ts.Caused by Failure of Implementing Procedure to Fully Address All Design Conditions.Revised Procedures (← links)
- 05000423/LER-1998-037, :on 980910 & 18,both SE Trains Were Declared Inoperable Due to Failure of Cvs Associated with Injection of Sodium Hypochorite.Caused by Inadequate Work Practice. Sodium Hypochlorite Injection Point Was Isolated (← links)
- 05000423/LER-1988-021, :on 880819,area Temp for Environ Zone AB-06 Not Taken within Required 12 H Surveillance Interval.Caused by Personnel Error.Manual Area Temp Data Retrieval in Zone AB-06 Reinitiated (← links)
- 05000423/LER-1988-014, :on 880413,reactor Trip Occurred Resulting from Turbine Trip.Caused by Leaking Isolation Valves on Screen Wash Duplex Strainers.Operational Procedures Updated to Provide Screen Wash Strainer Cleaning Guidance (← links)
- 05000423/LER-1986-012, :on 860206,plant Received Feedwater Isolation Signal from hi-hi Water Level in Steam Generator C.Caused by Steam/Feedwater Transient Initiated by Turbine Bypass (Steam Dump) Valves Modulating Closed (← links)
- 05000423/LER-1986-008, :on 860202,turbine Bldg Ventilation Stack Radiation Monitors Out of Svc & 12 H Grab Samples Required by Tech Spec Action Statement 3.3.3.10 Not Taken.Caused by Chemistry Dept Error.Samples Taken (← links)
- 05000423/LER-1986-007, :on 860202,limiting Condition for Operation & Action Statement for Tech Spec 3.8.4.1 Not Met.Caused by Failure to Adequately Track Weekly Surveillance Requirement. Action Statement Added to Dept Tracking Sys (← links)
- 05000423/LER-1986-011-01, :on 860205,recurring Problem W/Control Bldg Inlet Ventilation Radiation Monitors HVCRE16A & HVCRE16B Identified Which Resulted in Control Bldg Isolation Signals. Caused by Noise Spike (← links)
- 05000423/LER-1986-009, :on 860204,feedwater Isolation Occurred.Caused by Excessive Leakage Through motor-driven Feedwater Pump Balancing Valve.Air Set Moved to Nonvibrating Mount Adjacent to Valve & Copper Tubing Replaced (← links)
- 05000423/LER-1988-015, :on 880415,determined That Action Taken to Terminate Previously Documented Unidentified Leakage Event Improperly Performed.Caused by Personnel Error.Operations Dept Personnel Sent Internal Memo Re Event (← links)
- 05000423/LER-1986-006, :on 860125,integrity of Control Room Pressure Envelope Violated W/O Notification of Shift Supervisor.On 860127,supplementary Leak Collection Sys Boundary Compromised.Plant Mgt Notified (← links)
- 05000423/LER-1986-003, :on 860119,while in Hot Standby,Reactor Tripped Due to Safety Injection Signal from Rate Compensated Steam Line Low Pressure of Steam Generator B.Caused by Safety Relief Valves Opening Below Setpoints (← links)
- 05000423/LER-1986-001, :on 860116,during Hot Standby Mode,Reactor Tripped Due to Safety Injection Signal from Rate Compensated Steam Line Low Pressure of Steam Generator A.Caused by Quick Opening of Atmospheric Steam Dump Valve (← links)
- 05000423/LER-1986-002, :on 860118,reactor Trip Occurred When Nuclear Instrumentation Source Range Channel a Indicated Greater than 105 Counts Per Second.Caused by Momentary Spike Due to Noise from Welding (← links)
- 05000423/LER-1988-013, :on 880328,incomplete Installation to Circuits in Hydrogen Recombiner Sys Determined.Caused by Circuits Not Being Installed in Accordance W/Last Design Document.Work Completed as Described in Design Document (← links)
- 05000423/LER-1988-012, :on 880318,fire Boundary Door Found Blocked Open by Temporary Air Hose W/O Hourly Fire Watch Patrols. Caused by Procedural Deficiency.Hose Removed & Door Closed to Reestablish Fire Barrier (← links)
- 05000423/LER-1988-019, :on 880611,automatic Control Bldg Isolation Occurred.Caused by Personnel Error.Control Bldg Ventilation Immediately Placed in Filtered Recirculation & Correct Radiation Engineering Calibr Factor Installed (← links)
- 05000423/LER-1988-010, :on 880209,discovered That Nuclear Instrumentation Negative & Positive Rate Reactor Trips Set Nonconservatively.Caused by Personnel Failing to Properly Account for Leakage on Excore Instrumentation (← links)
- 05000423/LER-1988-009, :on 880210,automatic Reactor Trip Occurred. Caused by Inability of Assigned Operator to Control Feedwater to All Steam Generators Simultaneously Due to Insufficient Job Planning by Shift Supervisor (← links)
- 05000423/LER-1988-005, :on 880119,cold Overpressure Protection Sys Failed to Operate During Pressure Transient.Caused by Closure of RHR Valves Due to Misuse of Design Drawings. Procedure to Use Sys Being Prepared (← links)
- 05000423/LER-2020-002, 3, Automatic Reactor Trip Due to Main Generator Ground Fault (← links)
- 05000423/LER-1997-039, :on 970614,inoperability of Turbine Bldg Sump Effluent Monitor DAS-RE50 Discovered Due to Failure to Recognize Design Deficiency That Resulted in TS Violation. Repaired Turbine Bldg Sump Effluent Monitor Solenoid Valve (← links)
- 05000423/LER-1988-004, :on 880118,control Bldg Isolation Signal Occurred from Train B Control Bldg Ventilation Sys Supply Air Duct Chlorine Detector.Caused by Failed Chlorine Detector.Sensing Element Replaced (← links)
- 05000423/LER-1997-038, :on 970613,identified Single Failure Potential for Fuel Bldg Filter Exhaust Fans.Caused by Failure to Recognize Design Deficiency.Will Prepare & Implement Design Change of Fuel Bldg Filter Exhaust Ventilation Sys Damper (← links)
- 05000423/LER-1988-003, :on 880116,emergency Diesel Generator Train B Started Due to Bumped Relay Allowing Test Signal to Commence Emergency Load Sequencing.Caused by Relay Failure.Procedures Changed to Remove Dependency on Relay (← links)
- 05000423/LER-1997-033, :on 970527,P-6 Bistable Reset Function Was Set non-conservatively Resulting in TS Violation.Cause Is Indeterminate.Intermediate Range Neutron Flux Will Be Brought Into Compliance W/Ts (← links)
- 05000423/LER-1988-011, :on 880222 & 29,containment Leakage Detection Sys Surveillances Missed.Caused by Personnel Error Re Transfer of Incorrect Surveillance Frequencies During Procedural Rev.Memo Distributed (← links)
- 05000423/LER-1988-007, :on 880203,manual Reactor Trip Initiated Due to Inoperable Digital Rpi.Caused by Equipment Failure.Display Card for Rod N-11 Warped Resulting in Pins on Card to Contact Adjacent Card.Display Card Replaced (← links)
- 05000423/LER-1997-023, :on 970220,MSIV Had Not Been Tested IAW Literal Requirements Contained within TS Due to Inadequate Review During Development & Certification.License Amend Request Will Be Submitted by 970430 (← links)
- 05000423/LER-1987-049, :on 871216,engineering Evaluation Required by Plant Tech Specs Not Performed within Allotted Time Frame. Caused by Misinterpretation of Action Statement of Tech Specs 3.7.10.Engineering Evaluation Performed (← links)
- 05000423/LER-1986-014, :on 860210,reactor Trip Signal Received When Level in Steam Generator 2 Decreased to low-low Level Trip Setpoint.Caused by Personnel Error.Temporary Leads in Use Removed.Correct Leads Installed (← links)
- 05000423/LER-1986-015, :on 860212,plant Received Reactor Trip from Low Steam Generator Level.Caused by Error in Procedure Covering Operation of Main Feedwater Pumps.All Safety Sys Actuated Properly.Procedure Revised (← links)
- 05000423/LER-1986-016, :on 860208,containment Area CS-01 Exceeded 120 F Specified Limit.Caused by Pressurizer Cubicle Exceeding Temp Limit.All Environmentally Qualified Equipment Verified as Operable (← links)
- 05000423/LER-1986-027, :on 860319,emergency Generator Load Sequencer Train a Received Safety Injection Signal.Caused by Failure of Personnel to Adequately Review Design Changes.Procedures Reviewed & Updated (← links)
- 05000423/LER-1986-028, :on 860319,feedwater Isolation Occurred When Steam Generator Levels Increased to 82%.Caused by Procedural Inadequacy.Plant Shutdown Procedure Revised (← links)
- 05000423/LER-1996-031-02, :on 960906,potential Failure of Safety Related Control Valves Due to Failure of non-qualified Air Regulators,Concluded.Caused by Failure to Consider Potential for Pressure Regulator Failure.Design Mod Being Developed (← links)
- 05000423/LER-1996-031-01, Forwards LER 96-031-01 Per 10CFR50.73(a)(2)(v).Commitments Contained within Attachment 1 to Ltr (← links)
- 05000423/LER-1997-029, :on 970417,design Basis Concern on SGTR Analysis for Main Steam Pressure Relief Bypass Valves, Determined.Caused by Failure to Recognize Design & Single Failure Requirements.Ts Change Request Submitted by 970615 (← links)
- 05000423/LER-1997-028, :on 970410,potential Loss of Net Positive Suction Head Door Recirculation Spray Sys Pumps,Identified. Caused by Inadequate Review & Process Control.Recirculation Spray Sys Restored to Compliance W/Npsh Design Basis (← links)
- 05000423/LER-1985-001-01, :on 851209,during Cold Shutdown,Small Perforation Discovered in Fuel Oil Header Pressure Return Line Tubing of Emergency Diesel Generator A.Caused by Cyclic Vibration & Chafing Against Skid Frame (← links)
- 05000423/LER-1997-017-01, Forwards LER 97-017-01,documenting an Event That Occurred at Millstone Nuclear Power Station,Unit 3 on 970206.Commitments Made within Ltr,Encl (← links)
- 05000423/LER-1996-049-02, :on 961211,non-compliance to Non Class 1E Electrical Cable Separation Was Noted.Caused by Inadequate Electrical Separation Insp.Work Planning Process Procedures Have Been Revised (← links)
- 05000423/LER-1996-049-01, Forwards LER 96-049-01,documenting an Event That Occurred at Mnps,Unit 3 on 961211.Commitments Made within Ltr,Encl (← links)
- 05000423/LER-1986-025, :on 860315,control Bldg Inlet Ventilation Radiation Monitor 3HVC*RE16B Not Fully in Svc.Caused by Personnel Error.Software Mods Removed & Sys Restored to Normal Operation (← links)
- 05000423/LER-1986-026, :on 860301,plant Process Computer,Which Provides Axial Flux Difference Alarm,Stopped Operating. Caused by Operator Error.Operators Briefed on LER (← links)
- 05000423/LER-1986-020, :on 860301,RCS Loop 2 Hot Leg Injection Valve 3SIL*V932 Found danger-tagged Shut Instead of Locked Open as Required by Plant Operational Mode.Valve Reopened.Review of All danger-tag Restorations Conducted (← links)
- 05000423/LER-1997-031, :on 970507,RHR Valve Low Pressure Open Permissive Bistable Setting Was Set non-conservatively. Caused by Implementation of Incorrect Calibration Info. Re-evaluated RHR Suction/Isolation Valve LPI Calibrations (← links)
- 05000423/LER-1995-019-01, :on 951201,reactor Coolant Sys Pressure Boundary Leak Occurred Due to Instrument Line & Drain Line Socket Weld Failure.All 16 RCS Loop Flow Instrument Line Socket & Weld Bosses Have Been Cut & Removed (← links)
- 05000423/LER-1997-008, :on 970124,TS 3.0.3 Action Statement for MSIV Closure Was Entered Due to TS Being Inconsistent W/Msiv Safety Function & Design.Submitted Proposed License Amend Request Ptscr 3-13-95 (← links)
- 05000423/LER-1996-009, :on 960423,inoperable Shutdown Margin Monitors from Low Count Rate Occurred Due to Inadequate Design Control.Reduced SMM Setpoint (← links)
- 05000423/LER-1996-015-04, Forwards LER 96-015-04,documenting Condition Determined at Unit 3 on 960610.Util Commitments in Response to Event Contained within Attachment 1 to Ltr (← links)
- 05000423/LER-1997-006, :on 970117,RHR Suction Isolation Valves Open But Not Under Administrative Control as Required in Mode 4 by TS SR 4.6.1.1.a.Caused by Failure to Identify Conflict Between Requirements.Rhr Required Position Determined (← links)
- 05000423/LER-1997-006-01, Forwards LER 97-006-01 Per 10CFR50.73(a)(2)(i).Util Commitments in Response to 970117 Event Contained within Attachment 1 (← links)
- 05000423/LER-1997-026, :on 970325,missed Performances of SWS Support Exams Required by ASME Section Xi.Caused by Inappropriate Decision Re Classification of These Component Supports. ISI Program Documents Will Be Revised by 970630 (← links)
- 05000423/LER-1996-048, :on 961202,failed to Complete TS Required Testing of Chs Pump While Shutdown.Caused by Lack of Verbatim Compliance W/Ts.Performed Load Shed Surveillances (← links)
- 05000423/LER-1996-036-01, Forwards LER 96-036-01,documenting Condition at Facility on 960926.Commitments Listed (← links)
- 05000423/LER-1986-013, :on 860207,feedwater Isolation Signal Received & Reactor Tripped When Steam Generator Level Exceeded 82%. Caused by Large Sys Demand from Lifted Relief Valve in Auxiliary Steam Sys.Valve Setpoint Raised (← links)
- 05000423/LER-1986-010, :on 860204,reactor Trip Occurred Due to Level Deviation in Steam Generator 2.Caused by Operator Error in Manually Controlling Steam Generator Level.Automatic Steam Generator Level Control Sys Operable (← links)
- 05000423/LER-1997-025, :on 970310,failure to Enter TS 3.0.3 Was Noted Upon Loss of Vital AC Bus VIAC-1.Caused by Failure to Address Inconsistency Between TS 3.3.2 & TS 3.8.3.1 During Development.Procedures Will Be Revised (← links)
- 05000423/LER-1996-009-02, Submits Table of Commitments Re LER 96-009-02 Per 10CFR50.73(a)(2)(ii) (← links)
- 05000423/LER-1997-022, :on 970218,improper Survillance Testing of CR Emergency Air Filtration Sys Filters Occurred.Caused by Lack of Trigger Mechanisms within Applicable Maintenance Procedures.Cr Air Filtration Sys Will Be Revised by 970315 (← links)
- 05000423/LER-1985-002-01, :on 851215,during post-core Load Testing While in Cold Shutdown,Reactor Tripped from Two 10-10 Level Bistables on Steam Generator C.Caused by Personnel Error (← links)
- 05000423/LER-1985-003-01, :on 851214,while in Cold Shutdown,Emergency Bus 480-volt Ac Required to Be Operable Per Tech Specs Tagged Out of Svc to Perform Maint.Caused by Personnel Error.Bus Restored to Svc (← links)
- 05000423/LER-1997-018, :on 970208,determined Plant Operated in Conditions Prohibited by 3 Different Ts.Caused by Interpreting TS for Intent Rather than Compliance W/Spec.Ts &/Or Bases Will Be Revised (← links)
- 05000423/LER-1997-016, :on 970206,piping Supports for Portions of RHR Sys in Condition Inconsistent W/Design Installation Details.Caused by Improper Installation of Spacer During Initial Const Activities.Restored Piping Supports (← links)
- 05000423/LER-1997-015, :on 970204,review of Design Calculations Identified Min Water Level in Containment Sump at Time of RSS Pumps Below Vortex Suppression Grating During Loca. Caused by Inadequate Review/Process Control.Program Revised (← links)
- 05000423/LER-1997-014, :on 970203,both Trains of CR Envelope Pressure Sys Inoperable Due to Personnel Error.Valves Closed, Reestablishing TS Compliance & Terminating Event,Personnel Involved Counseled on Procedure Adherence (← links)
- 05000423/LER-1997-010, :on 970129,electrical Calculation Discrepancies Identified in Min Voltage Analysis for Class 1E Electrical Sys.Caused by Lack of Configuration Mgt for Comprehensive Calculation Program.Program Being Revised (← links)
- 05000423/LER-1996-045-01, :on 961107,electrical Separation Design Conflict with FSAR Identified.Caused by Breakdown in FSAR Revision Process.Design Basis Will Be Revised to Identify Deviations from Reg Guide 1.75,Position C.6 (← links)
- 05000423/LER-1996-044-01, :on 961108,qualification of Containment Sys Noted Following Design Basis Accident.Determined That Fwa Sys Was Not Rated at Containment Design Temp of 280 Degrees. Design Review of Fwa Sys Will Be Performed Prior to Entry (← links)
- 05000423/LER-1997-015-03, Provides List of Commitments Made Re LER 97-015-03 Per 10CFR50.7.(a)(2)(ii)(B),10CFR50.73(a)(2)(v)(D) & 10CFR50.73 (a)(2)(vii) (← links)
- 05000423/LER-1997-007, :on 970123,non-conservative Assumptions Used in TSs Shutdown Margin Curve Identified.Caused by Lack of Procedures for Generation & Documentation of Reactor Operational Info.Engineering Procedure Will Be Revised (← links)
- 05000423/LER-1996-042-01, :on 961028,TS Response Time Surveillance Testing of Containment Fuel Drop RMS Monitors Not Performed. Caused by Inadequate Definition of Roles & Responsibilities for Receipt & Incorporation.Procedures Revised by 970331 (← links)
- 05000423/LER-1996-043-01, :on 961024,internal Audit Identified Potential Inconsistency W/Interpretation of TS Requirements. Inconsistencies Confirmed on 961107.Caused by Operator Misunderstanding of TS Compliance.Procedures Revised (← links)
- 05000423/LER-1996-041-01, :on 961024,bypass Flow Around Swp Discharge Strainers Resulted in ECCS & ESF Sys Potentially Inoperable Following Postulated LOCA Due to Potential for Loss of Coolant.Replaced Swp Discharge Strainers (← links)
- 05000423/LER-1996-040-01, :on 961024,potential Component Cooling Sys Overcooling Noted Due to Loss of Instrument Air Sys Concurrent W/Low Svc Water Inlet Temp.Ccp Heat Exchanger Outlet Temp Control Valve Will Be Modified (← links)
- 05000423/LER-1997-004, :on 970114,lack of Verbatim Compliance with TS Surveillance Requirements for Molded Case Circuit Breakers Occurred.Caused by Addl Lack of Verbatim Compliance. Corrected 18 Month Surveillances Will Be Performed (← links)
- 05000423/LER-1997-003-01, :on 970113,potential for Recirculation Spray Sys Piping Failure Occurred Due to RSS Pump Stopping & Restarting During Accident Conditions.Performed Evaluation of RSS Water Column Separation Issue (← links)
- 05000423/LER-1996-015-02, Forwards LER 96-015-02 Re Inadequate Electrical Separation Between Redundant Protection Trains Associated W/Reactor Trip Switches & Reactor Trip Breaker Indicating Lights (← links)
- 05000423/LER-1996-026, :on 960730,non-conservative Primary Grade Water Flow Rates Was Used in Boron Dilution Safety Analysis. Caused by Loss of Control of Tracking Appropriate Design Basis Calculations.Calculations Will Be Updated or Deleted (← links)
- 05000423/LER-1996-026-02, Forwards LER 96-026-02 Which Documents Condition That Was Determined at Plant,Unit 3 on 960730 (← links)
- 05000423/LER-1996-039-01, :on 961015,observed Debris in C & D Recirculation Spray Sys Pump Suction Lines.Caused by Ineffective Inspections.Removed Foreign Matl from RSS Pump Suction Piping & Inspected Piping Internals (← links)
- 05000423/LER-1997-002, :on 970108,torquing of Battery Connections Not Performed as Part of Connection Tightness Checks Occurred. Caused by Lack of Effective Verification & Validation of Maint Procedure.Procedure Revised (← links)
- 05000423/LER-1996-038-01, :on 961010,personnel Determined TS Requirement for Operability of High Pressure Safety & Charging Sys Pumps Had Not Been Met.Caused by Intepreting TS as to Intent Rather than Ensuring Compliance.Procedure Implemented (← links)
- 05000423/LER-1997-001-01, :on 970104,discovered Lack of Verbatim Compliance W/Ts SRs for 125 Volt Batteries & Battery Chargers.Caused by Misconception That Performing Surveillances Was Acceptable.Revised Procedures (← links)
- 05000423/LER-1996-019, :on 960627,reactor Coolant Sys Power Operated Relief Valve Block Valves Inoperable Due to Potential Structural Design Deficiency.Full Scale Testing Has Been Performed by Kei & Results Provided in Rept (← links)
- 05000423/LER-1996-019-01, Forwards LER 96-019-01 Documenting Event That Occurred at Millstone Nuclear Power Station Unit 3 on 960627.Util Commitments Made within Ltr,Listed (← links)
- 05000423/LER-1996-051-01, :on 961221,TS Requirements for Application of 25% Surveillance Interval Extension of SR 4.0.2 to LCO Action Statements Misinterpreted.Caused by Incorrect Application of TS 4.0.2.Practice Discontinued (← links)
- 05000423/LER-1996-049, Forwards LER 96-049-00,documenting Condition That Was Discovered at Plant,Unit 3 on 961211.Util Commitments Made within Ltr,Listed (← links)
- 05000423/LER-1996-050-01, :on 961211,chill Water Pump Suction Pressure Gauges (3HVK-P126A & 3HVK-P126B) Did Not Meet Instrument Range Requirements.Caused by Inadequate Administrative Structure for IST Program.Procedure Change Implemented (← links)
- 05000423/LER-1996-028, :on 960916,potential Overcooling of Charging Pump Lube Oil Sys Occurred Due to Failure of air-operated Temperature Control Valves.Temporary Mod to Limit Failure Position of Three Way Cce Temp Control Valve,Installed (← links)
- 05000423/LER-1996-007, :on 960403,containment Recirculation Spray, Quench Spray & Safety Injection Sys Were Outside Design Basis Due to Design Errors.Design Reviews of Rss,Qss,Si & Other Sys Will Be Performed (← links)
- 05000423/LER-1996-007-02, Forwards LER 96-007-02 Which Supplements Rept Submitted on 960502,per 10CFR50.73(a)(2)(ii)(B),10CFR50.73(a)(2)(v)(B&D), 10CFR50.73(a)(2)(vii)(B&D).Commitments in Response to Event, Encl (← links)
- 05000423/LER-1996-046-01, :on 961108,time Response of Containment Fuel Drop Radiation Monitor Less Conservative Then Value Assumed within Fsar.Caused by Inadequate Original Design & Failure of Surveillance Test Program.Design Reviewed (← links)
- 05000423/LER-1996-037-01, :on 961002,spent Fuel Pool Cooling Sys Potentially Inoperable Following an SSE Occurred Due to Failure of Nonseismic Connecting Piping.Mod Will Be Completed Prior to Entry Into Mode 4 (← links)
- 05000423/LER-1996-002, :on 960310,inadequate Surveillance for Determining Shutdown Margin When Unisolating Rcl Occurred Due to Procedure Inadequacy.Changes Will Be Made to Technical Requirements Manual (← links)
- 05000423/LER-1996-030-02, :on 960905,nuclear Instrument Channels Were Not Tested in Accordance W/Fsar Requirements.Caused by Procedural Error.Procedures Changed (← links)
- 05000423/LER-1996-029-02, :on 960830,functional Deficiency Was Noted in Setting of ECCS Throttle Valve Positions.Caused by Deficiency in Original Design Sys.Plant Mod Will Be Prepared to Resolve Pump Boost,Valve Clogging & Valve Erosion Issues (← links)
- 05000423/LER-1996-035-01, :on 960920,motor Operated Valve Performance Found Outside Design Basis of Plant.Caused by Inadequate Design & Verification of Actuator.Mov Calculations Will Be Revised (← links)
- 05000423/LER-1996-034-01, :on 960918,RHR Pump Suction Rv Setpoint Was Not IAW Tss.Caused by Design Change Not Specifying That TS Change Was Required.Processed TS Change Request (← links)
- 05000423/LER-1996-033-01, :on 960909,spent Fuel Pool Storage Potentially Outside of Design Basis During Seismic Events as Result of Boraflex Embrittlement Discovered.Caused by Original Design Seismic Analysis.Tss Revised (← links)
- 05000423/LER-1996-032-01, :on 960910,HPSI Rv Piping Hydrostatic Test Was Found to Be non-compliance W/Asme Code Due to Personnel Error.Performed Test at Required Test Frequency (← links)
- 05000423/LER-1996-001-02, :on 960120,supplementary Leak Collection & Release Sys Declared Inoperable Due to Equipment Failure of Door Latch.Door Repaired & Plant Returned to 100% Power (← links)
- 05000423/LER-1992-033, :on 921231,discovered TS Fire Boundary Wall Incomplete Due to Work Practices During Construction.Fire Protection Sys Engineer Will Continue to Work W/Operations Dept to Strengthen Surveillance Process (← links)
- 05000423/LER-1992-024-01, :on 921015,ESF Bldg Normal Ventilation Radiation Monitor Declared Inoperable & Temporary Sample Rig Installed.On 921015 & 16,breaker Tripped Open.Caused by Inadequate Installation.Breaker Reset (← links)
- 05000423/LER-1992-032, :on 921219,channel Check of Process Flow Monitor for Ventilation Vent Radiation Monitor Improperly Completed Due to Inattention to Detail by Operator.C/A Included Counselling Shift Operators (← links)
- 05000423/LER-1992-031, :on 921214,deficiency Noted in Surveillance Procedure for Westinghouse 7300 High Pressure Output Relay for Porvs.Caused by Procedural Deficiency.Sp Will Be Written to Cover Testing Evolution (← links)
- 05000423/LER-1992-030-01, :on 921209,discovered Outside Air Temperature Fell Below Outside Air Temp Design Basis for Charging Sys.Caused by Outside Air Temperature Dropping Below 17 Degrees.Amend to License Issued (← links)
- 05000423/LER-1992-009, :on 920325,CR Operators Discovered That Required Channel Checks for full-range Containment Pressure Indication Not Deleted from CR Rounds.Caused by Personnel Error.Event Reviewed & Procedure Changed (← links)
- 05000423/LER-1992-029, :on 921120,turbine Load Rejection Transient Resulted in Reactor Trip Followed by Turbine Trip.Caused by Degraded 120-volt Ac Bus Voltage.Throttle Pressure Limiter Disabled to Prevent Reactor Trip (← links)
- 05000423/LER-1992-028, :on 921116,reactor Trip Signal Occurred Due to IR High Level Signal.Caused by Cognitive Personnel Error. Review of Prerequistes & Methods for Conducting Surveillance Testing Underway (← links)
- 05000423/LER-1992-025, :on 921102,LCO 3.4.9.2.a Not Initiated for Pressurizer Heatup.Caused by Lack of Detailed Procedural Guidance & Licensed Operator Error.Procedure Change Re Insurge During Plant Heatup Implemented (← links)
- 05000423/LER-1992-026-01, :on 921103,CR Staff Determined That Performing Check Valve Testing Per Surveillance Procedure Would Align Train B of HPSI to Both Hot & Cold Leg Injection Path.Caused by Inadequate Procedure.Mod Program Changed (← links)
- 05000423/LER-1992-027, :on 921105,electrical Fault Protection Signal in Zone Between Generator & Switchyard Resulted in Reactor Trip,Turbine Trip & Generator Trip.Caused by Spurious Signal from Relays.Design Change to Be Pursued (← links)
- 05000423/LER-1992-021-01, :on 920831,discovered That Testing for Loop Stop Valve Not Adequate.Caused by Incomplete Review When Preparing Containment Electrical Penetration Protection Drawing.Backup Breakers for Valves Verified (← links)
- 05000423/LER-1992-020-01, :on 920824,Auxiliary Bldg Filter Sys Fans Tripped W/Vivs Set at 100%.Caused by Failure to Perform Adequate Technical & Safety Evaluation of Auxiliary Bldg Filter Sys.Event Will Be Reviewed W/Engineers (← links)
- 05000423/LER-1992-016, :on 920704,both Trains of Auxiliary Bldg Filters Declared Inoperable When Access Door on Common Intake Plenum for Subj Bldg Found Open.Caused by Impoper Design.Door Locked Wired Shut (← links)
- 05000423/LER-1992-019-01, :on 920818,determined That Trains a & B of Hydrogen Recombiner Sys Had Been Inoperable Between 920812 & 17 & Train a Positive Displacement Blower Motor Found W/ Lifted Lead Due to Personnel Error (← links)
- 05000423/LER-1996-027-02, :on 960813,tornado Missile Protection for Manhole Covers Were Not Installed,Due to Original Construction.All Five Manhole Covers Were Securely Anchored by Placement of Ballast (← links)
- 05000423/LER-1996-014-02, :on 960516,surveillances for Emergency Diesel Generator Performed During Operation,Versus Shutdown.Caused by Misinterpretation of Shutdown Stipulation.Surveillances Performed During Shutdown (← links)
- 05000423/LER-1996-013-02, :on 960515,determined Design Deficiency in Residual Heat Removal System (Rhs).Caused by Original Plant Design.Corrective Actions Will Be Described in Supplement (← links)
- 05000423/LER-1996-012-02, :on 960515,containment Leakage Exceeded Tech Spec Limit.Caused by Boric Acid Residue.Performed Flush of Line to Remove Boron Deposits (← links)
- 05000423/LER-1996-003-01, :on 960312,temporary I-Beams Located Overhead of Recirculation Spray Sys HXs Discovered.Caused by Inadequate Work Control.Work Control Procedures Revised (← links)
- 05000423/LER-1996-002-02, :on 960310,inadequate Surveillance for Determining Shutdown Margin When Unisolating Rcl Identified. Caused by Inadequate Procedure.Procedures Revised (← links)
- 05000423/LER-1996-012, :on 960515,containment Leakage in Excess of TS Limits Noted,Due to Valve Leakage.Containment Spray Line Penetration 100 Flushed to Remove Any Boron Deposits.W/ (← links)
- 05000423/LER-1996-010-02, :on 960425,determined That Potential Failure Mode of Rod Control Sys Acopian Power Supplies Could Create Unanalyzed Condition.Caused by Inadequate Design Review. Reset Feature Will Be Deleted (← links)
- 05000423/LER-1996-007-01, :on 960403,CRS & Qs Sys Found Outside Design Basis Due to Design Errors.Restored Sys to Appropriate Design Basis Requirements Prior to Declaring Sys Inoperable (← links)
- 05000423/LER-1996-025-02, :on 960725,Arcor S-30 Pieces Were Found in Recirculation Spray Sys Heat Exchangers.Caused by Transients Flow Conditions w/2 Psw Pumps Running Together During Esf/Lop Testing.Arcor Pieces & Debris Removed (← links)
- 05000423/LER-1996-005-03, :on 960321,design Noncompliance Noted for High Temp Automatic Start Feature of SWS Booster Pumps.Caused by Weakness in Design Control Process.Operating Procedures Revised (← links)
- 05000423/LER-1996-013, :on 960612,design Deficiency in Rhrs.Caused by Inconsideration That Failure Mode of RHS Flow Control Valves Could Create High RHS Heat Exchanger CCP Discharge Temps. Actuators for Heat Exchanger Valves,Modified (← links)
- 05000423/LER-1996-024-02, :on 960712,IST of Stop Check Valve in Steam Supply to Turbine Driven AFW Pump Was Missed Due to Programmatic Weakness.Completed Insp of Motor Operated Stop Check Valve (3MSS*MOV17D) (← links)
- 05000423/LER-1992-123, :on 921003,determined That Surveillance Testing for Emergency 4,160 Volt Undervoltage Relays Did Not Satisfy Requirements of Ts,Due to Incorrect Survillance Procedure. Procedures Will Be Revised Per TS Requirements (← links)
- 05000423/LER-1996-023-02, :on 960701,failed to Include Fuel Transfer Tube Bellows within Containment Penetration Test Program.Caused by Incomplete Test Procedure.Completed Testing of Fuel Transfer Tube Expansion (← links)
- 05000423/LER-1996-019-02, :on 960627,RCS PORV Block Valves Were Determined to Be Unable to Perform Intended Safety Functions.Caused by Structural Design Deficiency.C/A Will Be Provided in Supplement to Rept (← links)
- 05000423/LER-1996-020-03, :on 960627,Mode 5 of Ms Motor Driven Atmospheric Relief Valves Were Determined Not to Be Able to Perform Safety Functions.Caused by Personnel Error.Revised Design Basis Review & Thrust Calculation (← links)
- 05000423/LER-1996-022-02, :on 960722,EDG Control Panel Noncompliance W/Seismic Design Basis Occurred.Caused by Personnel Error. All Latches Repaired & Restored (← links)
- 05000423/LER-1996-017-02, :on 960621,determined Design Deficiency Existed in Tornado Protection Ventilation Dampers,Could Have Affected EDGs Following Tornado.Caused by Inadequate Original Plant Const Design.Procedure Revised (← links)
- 05000423/LER-1996-016-02, :on 960619,switchgear Cabinet in Noncompliance W/Seismic Design Basis & Subsequently Inadvertent Esfa Signal Occurred.Personnel Did Not Latch Known Seismic Latches as Required.Engaged Latches (← links)
- 05000423/LER-1992-017, :on 920717,determined That One Train of Pressurizer Steam Space Vent Path Was Inoperable & Action Statement Not Performed.Caused by Personnel Error.Changes to TS Will Be Submitted to Clarify Actions (← links)
- 05000423/LER-1996-011-02, :on 960512,determined That Both Trains of CR Envelope Pressurization Sys Inoperable Due to Imbalance in air-conditioning Sys.Cr air-conditioning Sys Rebalanced.W/ (← links)
- 05000423/LER-1996-008-01, :on 960412,reactor Protection Sys Lead/Lag Time Constants Found non-conservative.Caused by Failure of Vendor to Identify Conservative Calibr Requirements.Tss Changed to Correctly Identify Direction of Conservatism (← links)
- 05000423/LER-1996-006-02, :on 960330,plant Shutdown Required by TS for AFW Containment Isolation Valves Declared Inoperable.Caused by Opened Valves Outside Containment.Unit Was Shutdown in Orderly Manner (← links)
- 05000423/LER-1995-020, :on 951202,RCS Pressure Boundary Leak from Valve Bonnet Stem leak-off Pipe Occurred.Caused by Crack Near Toe of Fillet Weld Between Pipe & Valve Body.Removed Pipe & Valve Bonnet Weld (← links)
- 05000423/LER-1996-005-02, :on 960321,service Water Booster Pump Auto Start Discovered Disable.Caused by Inadequate Review.C/A: Bypass Jumper Removed & Mod Initiated (← links)
- 05000423/LER-1996-004-02, :on 960316,auxiliary Feedwater Isolation Valves Noncompliance W/Ts Occurred.Caused by Misinterpretation of Ts.Event Reviewed W/Station Personnel to Caution Others on TS Surveillance Requirements (← links)
- 05000423/LER-1992-022-01, :on 920929,determined That Train B of Supplemental Leak Collection & Release Sys Inoperable & Operability of Train a Could Not Be Verified.Caused by Incomplete Sys Design.Test Procedure Revised (← links)
- 05000423/LER-1992-015, :on 920523,discovered That Containment Leakage in Excess of Limits Due to Valve Leakage.Hinge & Packing Cleaned & Lubricated (← links)
- 05000423/LER-1995-019-02, :on 951201,leaks Found in 3/4 Inch Socket Welds on C RCS Loop Flow Instrumentation Line & RCP Seal Injection Drain Line.Caused by Vibration Induced Fatigue at Stress Riser in Weld.Welds & Weld Bosses Removed (← links)
- 05000423/LER-1992-016-01, :on 920704,both Trains of Auxiliary Bldg Filters Declared Inoperable After Discovering Access Door on Common Intake Plenum for Abfs Open.Caused by Improper Design.Door Has Been Locked Wired Shut (← links)
- 05000423/LER-1992-014-01, :on 920507,determined That Static Pressure Effect Not Accounted for in Setpoints of Veritrak Dp Transmitters.Caused by Incorrect Assumptions.Setpoints Methodology for Transmitters Will Be Reviewed (← links)
- 05000423/LER-1992-013-01, :on 920411,determined That Temporary Sampling for Turbine Bldg Stack Monitor Improperly Connected.Caused by Inlet & Discharge Sample Lines Inadvertently Crossed. Sample Pump Procedures to Be Revised (← links)
- 05000423/LER-1995-022-01, :on 951214,ESF Actuation of AF Sys Occurred. Caused by Failure of C SG Atmospheric Dump Valve to Close.New Piston Rings Will Be Installed & Operator Training Will Be Conducted on Event (← links)
- 05000423/LER-1995-021-02, :on 951207,loop Stop Valves on One Loop Opened W/O Performing TS Surveillance Due to Procedure Inadequacy. Util Evaluated Whether Change Needed to Clarify TS (← links)
- 05000423/LER-1992-012, :on 920407,inadvertent Feedwater Isolation Signal Generated Due to Reactor Trip Breaker Testing.Caused by Procedural Inadequacy.Procedure Changed to Require Performing Steps in Sequence (← links)
- 05000423/LER-1992-011-01, :on 920405,reactor Manually Tripped Due to Loss of Operating Condensate Pumps,Causing Hotwell Level to Fluctuate.Caused by Design Deficiency.Traveling Water Screens A,B,C & F Replaced (← links)
- 05000423/LER-1995-020-02, :on 951202,discovered Leak on Valve Stem leak-off Pipe for RHR Supply from RCS Loop a Inboard Isolation Valve.Caused by Mechanical Damage Resulting from Tensile Overboard.Removed Pipe & Valve Weld (← links)
- 05000423/LER-1992-010-01, :on 920401,discovered That Surveillance Requirements Not Met Re Testing of Atmosphere Cleanup Filter Units.Caused by Failure to Identify Proper Surveillance Test Requirements.Procedures Revised (← links)
- 05000423/LER-1992-009-01, :on 920325,discovered That Required Channel Checks for full-range Containment Pressure Indication Deleted from Control Room Rounds.Caused by Personnel Error. Channel Checks Incorporated Into Logs (← links)
- 05000423/LER-1995-018-02, :on 951121,FSAR Limit for New Fuel Movement Over New Fuel Storage Racks Was Exceeded.Caused by Inadequate Procedures.Procedures Revised (← links)
- 05000423/LER-1991-018, :on 910708,determined That Both Supplemental Leak Collection & Release Sys Trains Were Inoperable.Caused by Design Deficiency.Fusible Links Were Replaced & SLCRS Returned to Svc (← links)
- 05000423/LER-1991-014, :on 910609,reactor & Subsequent Turbine Trip Occurred.Caused by phase-to-ground Fault on 345 Kv Sys Transmission Line & Loose Restraint Tap of Relay.Tap Screw & Wiring Repaired & Relay Returned to Svc (← links)
- 05000423/LER-1992-008-01, :on 920317,plant Personnel Verified That Eight Valves Not Included in Svc Water Sys TS Valve Lineup.Caused by Procedure Deficiency.Change to Valve Lineup Procedure Written & Valves Verified in Correct Position (← links)
- 05000423/LER-1995-017-02, :on 951012,TS Surveillance Was Missed Due to Programmatic Weakness & Personnel Error.Counseled Individuals Involved (← links)
- 05000423/LER-1995-005, :on 950413,discovered That Primary Containment Potentially Breached for Almost Two H on 950405 Due to Personnel Error & Program Weakness.Operators Involved Counseled on Importance of Task Review (← links)
- 05000423/LER-1995-005-01, Forwards Suppl LER 95-005-01,updating Cause of Event & Including Addl Actions to Prevent Recurrence (← links)
- 05000423/LER-1995-016-02, :on 950911,A Train Quench Spray Pump Discharge Valve Exceeded TS Surveillence Periodicity Limit.Caused by Programmatic Error.Surveillance Tracking Procedure Revised (← links)
- 05000423/LER-1992-001, :on 920113,leaking Monitoring Connection Containment Isolation Valves Were Not Locked Closed.Caused by Program failure-procedure Deficiency & Administrative Error.Valves Were Locked Closed (← links)
- 05000423/LER-1991-031, :on 911221,TS Surveillance on Ventilation Vent Radiation Monitor Missed & Grab Sample Not Performed for Approx 12 H.Caused by Administrative Oversight.Sample Obtained (← links)
- 05000423/LER-1991-030, :on 911219,engineering Evaluation Concluded Failure of Three Normally Energized Auxiliary Relays for MOV Was Caused by Insulation Breakdown.Caused by Accelerated Thermal aging.Non-SR J10s Evaluated & Replaced (← links)
- 05000423/LER-1992-007-01, :on 920305,nonlicensed Operator Failed to Perform Firewatch Tour of 45 ft,6-inch Elevation of West Motor Control Ctr Area Prior to Surveillance Test.Caused by Miscommunication.Hourly Firewatch Reinstated (← links)
- 05000423/LER-1992-006-02, :on 920306,discovered That Intermediate power- Range Power Above Permissibe (P6) Bistable Calibr Lower than TS Trip Setpoint.Caused by Procedural Deficiency.Bistable Recalibrated to More Conservative Value (← links)
- 05000423/LER-1992-004-02, :on 920224,B Train CR Pressurization Bottles Were Found Isolated by Two Manual Valves.Probably Caused by Personnel Error Associated W/Improper self-verification. Commitment Opened to Discuss self-verification (← links)
- 05000423/LER-1991-022, :on 910820,discovered That Closure of One Camparator Trip Switch Auxiliary Contacts Was Not Being Verified.Caused by Mgt Deficiency.Monthly Surveillances Were Modified to Verify Contact Closure (← links)
- 05000423/LER-1991-004, :on 910205,leak Rates for Four Containment Isolation Valves Occurred Exceeding Tech Spec Limits.Caused by Improper Valve Seating.Valves Opened & Inspected & Vendor of Valves Contacted (← links)
- 05000423/LER-1992-003-01, :on 920207,inadvertent Encl Bldg Integrity Breach Occurred.Caused by Inadequate Work Planning.Encl Bldg Integrity Restored & Erosion/Corrosion Exam Procedure Changed (← links)
- 05000423/LER-1995-015-01, :on 950718,missed ASME Insps Due to Programatic Oversight.Components Inspected by ASME XI VT-2 Certified Personnel (← links)
- 05000423/LER-1995-014-01, :on 950713,TDAFWP Did Not Start within One Minute as Required by TS While Performing Surveillance Test on Tdafwp Due to Governor Valve Position.Revised Procedures (← links)
- 05000423/LER-1991-024, :on 910905,+/-2g Range of a Safety Injection Accumulator Tank Triaxial Peak Accelerograph Was Not in Compliance W/Ts.Caused by Procedural Deficiency.Range Accelerograph Installed (← links)
- 05000423/LER-1991-019, :on 910725,shutdown Per TS Due to Svc Water Mussel Fouling.Caused by Design Deficiency.Reactor Plant Component Cooling Water & Diesel Heat Exchangers Cleaned.W/ (← links)
- 05000423/LER-1995-013-01, :on 950628,determined That an IST Surveillance Had Lapsed on C Charging Sys Pump & Discharge Check Valve. Caused by Inadequate Procedures.Surveillances Performed & Procedures Revised (← links)
- 05000423/LER-1991-027, :on 911014,reactor Trip Signal Generated Due to High source-range Channel 32 Detector Counts.Caused by Electromagnetic Interference on source-range Signal Due to Malfunctioning Machine.Procedures Modified (← links)
- 05000423/LER-1995-012-01, :on 950602,CR Received Containment Smoke Alarm. Caused by Flashing of Small Quantity of RCP Lube Oil. Performed Exam of Remaining Areas of Maint (← links)
- 05000423/LER-1995-011-01, :on 950515,mussel Shells Found in Recirculation Spray Sys Heat Exchanger.Caused by High Density of Mussel Plantigrades in Spring 1994.Hypochlorite Metering Pumps Installed (← links)
- 05000423/LER-1991-024-01, :on 910905,discovered That Triaxial Peak Recording Accelerograph Range Outside TS Requirements for Seismic Monitoring Instrumentation.Caused by Procedural Deficiency.New Accelerograph Installed (← links)
- 05000423/LER-1991-023-01, :on 910831,Wyle Labs Notified Util That Pressurizer Safety Valves Lifted Above Allowed Tolerance. Caused by Setpoint Drift.Analyses Underway to Support Design Basis Change (← links)
- 05000423/LER-1995-009, :on 950426, as Found Leak Rate for Containment Isolation Valves Exceeded TS Bypass Leakage Limit.Caused by Deterioration of Resilient Valve Seats.Seats Continue to Be Replaced (← links)
- 05000423/LER-1995-010-01, :on 950430,power Signal Was Lost During Refueling Outage Due to Procedural Weakness.Revised Procedure for Denergizing Emergency 4160 Volt Bus to Require Tagging Sequencer Bypass Switch (← links)
- 05000423/LER-1995-009-01, :on 950426,containment Leakage Exceeded TS Limits Due to Valve Leakage.Inspected Valve Seats for Containment Purge Supply & Exhaust Line Valves (← links)
- 05000423/LER-1995-004, :on 950322,historical Breaches Affected CR Pressurization & Secondary Containment Vacuum Due to Misinterpretation of Ts.Work Controls Minimized Possibility of Pressure Boundary Breaches (← links)
- 05000423/LER-1995-008-02, :on 950423,an Individual w/non-active SRO License Assumed Position of Refueling SRO W/O Activating License Per Requirements of 10CFR55.53(f).Cause Due to Lack of Sros.Active SRO Dispatched for Oversight (← links)
- 05000423/LER-1995-007-02, :on 950416,partial CDA Signal Generated When Limit Switch Contacts Grounded While Performing Mods.Caused by Personnel Error & Programmatic Weaknesses.Reviews W/ Affected Dept Personnel Performed (← links)
- 05000423/LER-1995-005-02, :on 950413,discovered That Primary Containment Potentially Breached for Almost 2 H on 950405.Caused by Personnel Error & Program & Procedure Weaknesses.Personnel Counselled & Tags Put on Drain Valves (← links)
- 05000423/LER-1995-006-01, :on 950413,MSSV Simmer Tested Below TS Setpoint Tolerance.Cause Unknown.No Generic Problem W/Safety Valves or pre-existing Condition Identified.Valve Reset & Verified (← links)
- 05000423/LER-1991-022-01, :on 910820,failure to Adequately Perform Overlap Testing of Containment Depressurization Actuation Loops Discovered.Caused by Mgt Deficiency.Review Will Be Performed to Identify Similar Concerns (← links)
- 05000423/LER-1991-019-02, :on 910725,plant Shutdown Initiated After Train B of Svc Water Declared Inoperable & Train B Could Not Be Restored within 72 H.Caused by Design Deficiency.Piping Cleaned & Will Be Flushed (← links)
- 05000423/LER-1991-021-01, :on 910728,containment Isolation Valve Found Locked Closed & Open.Caused by Improper Task Verification. Valve Opened & Instructions Re Tracking Valve Will Be Incorporated Into Training Program (← links)
- 05000423/LER-1991-003-01, :on 910203,spurious Control Bldg Isolation Signals Occurred.Caused by Deficient Design Resulting in Induced Noise Causing Spurious CBI Signals.Monitor Wiring, Cable Shielding & Grounding Scheme Modified (← links)
- 05000423/LER-1991-020-01, :on 910726,inadvertent Main Steam Isolation Signal Occurred.Caused by Wrong Switch Operation Due to Improper Work Practices.Importance of self-checking as Part of Routine Work Practices re-emphasized (← links)
- 05000423/LER-1991-018-01, :on 910708,common Mode Failure Occurred Leaving Both Trains of Supplemental Leak Collection & Release Sys Inoperable.Caused by Design Deficiency.Fusible Links Replaced (← links)
- 05000423/LER-1991-015-01, :on 910617,both Trains of SLCRS Became Inoperable When Access Cover for Common Exhaust Duct Was Removed Due to Deficient Procedure.Applicable Damper Testing Procedure Will Be Revised (← links)
- 05000423/LER-1995-003-01, :on 950304,separate Components in Independent Trains of ECCS Declared Inoperable Due to Loose Terminal Block in Exhaust Fan Circuitry.Tightened Terminal Block & Secured Retaining Cover (← links)
- 05000423/LER-1991-013-01, :on 910515,inoperable Train B EDG Identified. Caused by Improper Work Practices.Licensed Operator Involved Counselled on Importance of Reviewing Tech Spec Requirements Re Procedures (← links)
- 05000423/LER-1995-002-02, :on 950209,radioactive Source Was Found Outside Protected Area in Uncontrolled Location.Caused by Radiological Inventory Control Oversight.Surveyed Potentially Involved Areas (← links)
- 05000423/LER-1995-001, :on 950202,SWS Pipe Expansion Joint Discovered to Be Improperly Bolted.Caused by Loss of Work Control.Joint Properly Bolted (← links)
- 05000423/LER-1991-026-01, :on 910923,spurious High Radiation Control Bldg Isolation Signal Inadvertantly Actuated.Caused by Procedural non-compliance.Technicians Involved Counseled on Need to Ensure Good Communications (← links)
- 05000423/LER-1991-014-01, :on 910609,reactor Trip Occurred Due to Switchyard Malfunction.Broken Screw & Affected Wiring Repaired & Pilot Wire Relay Returned to Svc (← links)
- 05000423/LER-1991-012, :on 910503,spurious Control Bldg Isolation Signals Occurred.Caused by Radiation Monitor Power Supply Failure.Single Channel Area Monitor Board Replaced & Satisfactorily Tested (← links)
- 05000423/LER-1994-014-02, :on 941121,TDAFWP Failed to Start During Cold Start Surveillance Test.Caused by Preexisting Conditions of Tdafwp Trip Valve Linkage.Corrective Maintenance Performed on Linkage (← links)
- 05000423/LER-1994-015-02, :on 941229,CR Day Shift Did Not Have STA for 35 Min.Caused by Personnel Error.Immediate Efforts Made to Determine If Other Qualified STA Individuals on Site Could Fill Position (← links)
- 05000423/LER-1994-013-02, :on 940916,determined That Previous Plant start-ups Conducted W/Several Operability Tests Not Performed Prior to Entry Into Modes 4 & 3.Caused by Misinterpretation of Inconsistency in TS (← links)
- 05000423/LER-1991-017-01, :on 910702,both Supplementary Leak Collection & Release Sys Trains Discovered Inoperable.Caused by Design Deficiency.Fire Dampers Repaired (← links)
- 05000423/LER-1991-016, :on 910624,control Switch for Power Operated Relief Valve Discovered Inoperable.Caused by Inadequate Info Detailing Precise Switch.Individuals Involved Counseled on Need to Verify Proper Switch Functions (← links)
- 05000423/LER-1994-012-02, :on 940909,leak Was Discovered in Socket Weld on C RCS Loop Flow Instrumentation Line.Caused by Weld Defect.Ts Action Statement 3.4.6.2.a Was Entered.Weld Flaws Repaired (← links)
- 05000423/LER-1991-009-01, :on 910408,Train a Svc Water Portion of Svc Water Sys Declared Inoperable Due to Pipe Wall Thinning Caused by Erosion.Eroded Section of Piping Replaced W/ Erosion Resistant Piping (← links)
- 05000423/LER-1991-010, :on 910410,discovered That CO2 Storage Tank Pressure Below TS Limits of 275 Psig.Caused by Pressure Control Switch Coming Out of Adjustment.Fire Patrols Established & Employee Counseled (← links)
- 05000423/LER-1991-011, :on 910410,safety Injection Relief Valve Lifted While Performing Boundary Valve Test Procedure,Causing Inoperability of Both Trains of HPSI Sys.Caused by Relief Valve Leakage.Relief Valve Ungagged (← links)
- 05000423/LER-1991-008, :on 910318,two Channels Inoperable Causing Pressurizer Level Indicator Errors.Caused by Inadequate Design.Design Change During Refueling Outage,Condensate Pots Removed & Proper Temp Measurements (← links)
- 05000423/LER-1991-007-01, :on 910314,temporary Sample Pump Associated W/ Inoperable ESF Bldg Gaseous Effluent Radiation Monitor Turned Off,Causing Tech Spec Violation.Caused by Procedural Noncompliance.Chemistry Technician Counseled (← links)
- 05000423/LER-1991-005, :on 910216,control Building Isolation Signals Generated Due to Defective Breaker.Defective Ground Interrupter Breaker Permanently Replaced W/Equivalent Thermal Magnetic Circuit Breaker (← links)
- 05000423/LER-1994-010-01, :on 940726,trains of Charging Declared Inoperable.Caused by Overly Restrictive Acceptance Criterion for Cooling Pump Bearing Oil Level.Cooling Pump Level Changed to Provide Appropriate Operability (← links)
- 05000423/LER-1994-009-02, :on 940705,identified Unreliable Control Rod Position Indications.Caused by Failed Instrument Card in Drpi System.Failed Card Was Replaced & Surveillances Were Performed to Ensure System Was Fully Operable (← links)
- 05000423/LER-1991-006, :on 910224,failure to Fully Implement Radiation Monitor Action Statement.Caused by Inadequate Procedure. Temporary Log Immediately Used to Measured Process Flow at Least Once Every Four H (← links)
- 05000423/LER-1990-001, :on 910108,inoperable Fire Hose Stations Due to Insufficient Fire Hose Inventory.Cause Unknown for Fuel Bldg Fire Hose Rack & Procedural Inadequacy for Auxiliary Bldg Fuel Racks.Station Restored to Operable Status (← links)
- 05000423/LER-2020-001, Technical Specification Allowed Outage Time Exceeded by Accident Monitoring Instrument (← links)
- 05000423/LER-1990-029, :on 901123,temporary Sampling Flow Rate Readings for Radiation Monitor Not Recorded for 11 H & 19 Minutes.On 901128,radiation Monitor Improperly Restored to Operable Status.Caused by Personnel Error (← links)
- 05000423/LER-1994-003, :on 940125,outboard Containment Isolation Valve for ILRT Pressurization/Depressurization Line Was Found Unlocked Due to Procedure Deficiency.Procedures Have Been Revised & Addl Training Has Been Provided (← links)
- 05000423/LER-1994-008-01, :on 940505,identified Deficiency in Surveillance Testing for Bypass Relay Cards.Caused by Procedure Deficiency.All Suspected Relay Cards Were Tested & Operability Evaluation Was Performed (← links)
- 05000423/LER-1994-006, :on 940315,determined That Portions of AFW System Did Not Meet Design Requirements for Normal Use. Caused by Design Error.Afw Line Caution Tagged to Alert Personnel (← links)
- 05000423/LER-1994-005, :on 940210,containment Drain Sump Level & Pumped Captivity Monitoring Sys Not Performing in Accordance W/Ts.Caused by Personnel Error.After Design & Procedural Improvements,Original Sump/Pump Back in Svc (← links)
- 05000423/LER-1994-004-01, :on 940126,determined FWIV May Not Have Met Design & TS Closure Requirments Prior to 1989.Caused by Program Failure & Inadequate Design of Fwiv.No Corrective Actions Needed (← links)
- 05000423/LER-1994-003-01, :on 940125,outboard Containment Isolation Valve for ILRT Pressurization/Depressurization Line Found Unlocked.Caused by Personnel Error.Control Room Informed & Valves Relocked (← links)
- 05000423/LER-1990-028, :on 900904,control Bldg Isolation Signal Initiated by Train B Control Bldg Inlet Ventilation Radiation Monitor Due to Equipment Failure.Failed Train Detector Repaired (← links)
- 05000423/LER-1990-020, :on 900614,both Trains of Quench Spray & High Pressure Safety Injection Declared Inoperable.Caused by Deficient Surveillance Procedure.Surveillance Procedure on Svc Water Sys HXs Changed (← links)
- 05000423/LER-1990-023, :on 900615,determined That Both Trains of Containment Recirculation Pump Area Coolers Inoperable Due to Fouling of Cooler Hxs.Caused by Inadequate Surveillance Procedures.Hxs Cleaned & Repaired (← links)
- 05000423/LER-1990-013, :on 900416,manual Reactor Trip Occurred Due to Imminent Loss of Condenser Vacuum.Caused by Inadequate Administrative Guidance.Personnel Instructed to Closely Monitor Trash Rack Water Levels (← links)
- 05000423/LER-1990-018, :on 900601,discovered That Hourly Fire Watch Patrol Not Properly Established in ESF Sump Area After Associated Fire Assemblies Declared Inoperable.Caused by Personnel Miscommunication.Personnel Counseled (← links)
- 05000423/LER-1994-001-02, :on 940120,discovered That Overtemp Delta T & Overpower Delta T Channel Checks Not Being Adequately Performed Due to Procedural Deficiency.Channel Check on Four Delta T Channels Performed (← links)
- 05000423/LER-1994-002-01, :on 940123,notice That STA Absent Due to Personnel Error.Oncoming Shift Supervisor Reviewed Shift Schedule to Identify STA & Called STA to Report to Work.Sta Position Added to Shift Turnover Rept (← links)
- 05000423/LER-1993-021, :on 931106,reactor Coolant Pump Oil Collection Sys Was Not Seismically Mounted Due to Inadequate Review of Stress Calculations for RCP Oil Collection Sys.Repaired Affected Supports (← links)
- 05000423/LER-1993-023-02, :on 931223,boron Dilution Event Occurred Due to Procedure Deficiency.Decreased Turbine Load,Stopped Dilution Flow & Commenced RCS Boration (← links)
- 05000423/LER-1993-022-02, :on 931219,manual Containment Isolation Valve Discovered Unlocked Due to Equipment Interface.Short Shank Padlocks Replaced W/Long Shank Padlocks (← links)
- 05000423/LER-1993-009, :on 930617,determined That SLCRS May Have Been Inoperable During Certain Cold Weather Period.Caused by Failure to Account for Chimney Effect in Encl Bldg.Design Change Implemented to Increase SLCRS Capacity (← links)
- 05000423/LER-1990-027, :on 900811,Tech Spec Fire Door Discovered Blocked Open.Caused by Inadequate Training of Fire Watch Personnel.Door Closed & Fire Watch Personnel Issued Memo Reinforcing Importance of Patrol Info (← links)
- 05000423/LER-1993-018-01, :on 931010,discovered That Required Continuous Fire Watch Not Posted in East Switchgear Room Since 930921. Caused by Inappropriate Mgt Decision.Proper Fire Verified to Be in Place (← links)
- 05000423/LER-1993-017-01, :on 931006,noted That Response Time Test for Turbine Trip on High SG Level Portion of ESFAS Determined to Be Inadequate.Caused by Mgt Deficiency.Task Force Will Make Recommendations to Implement Testing (← links)
- 05000423/LER-1993-016-01, :on 931001,determined That non-conservatism Existed in Analysis for One of Plants Licensing Basis Accidents.Caused by Technical Error.Jco Has Been Developed & Approved to Allow Startup from Current Outage (← links)
- 05000423/LER-1993-015-01, :on 930923,daily Surveillance Shutdown Margin Improperly Performed.Caused by Procedural Deficiency. Refueling Operations Procedure Changed to Require Updating Plant Process Computer When New Core Installed (← links)
- 05000423/LER-1993-014-01, :on 930903,determined That Delayed Start of Train a Auxiliary Bldg Fan During Testing Due to Inherent Design Characteristics of Flow Switch.Design Changed to Provide Uninterruptible Source of Power (← links)
- 05000423/LER-1993-013-01, :on 930901,determined Reactor at Power Permissive Bistable Set to Incorrect Value.Caused by TS W/ Mutually Exclusive Conditions for P-10 Interlock.Tss Revised (← links)
- 05000423/LER-1993-021-02, :on 931106,discovered Reactor Coolant Pump Oil Collection Sys Not Seismically Mounted.Caused by Inadequate Review of Calculations.Affected Portions of Sys Repaired & Calculations Reviewed & Approved (← links)
- 05000423/LER-1993-020-02, :on 931101,discovered Plant Entered Mode 2 W/O Retesting Hydrogen Recombiner B & Entered Mode 4 W/O Retesting Several Containment Isolation Valves.Caused by Programmatic Deficiency.Retests Performed (← links)
- 05000423/LER-1993-012-01, :on 930805,discovered Train a of SWS Inoperable Due to Inadequate Work Planning by Const Dept.Removed Plywood & Performed Evaluation (← links)
- 05000423/LER-1993-014, :on 930903,train a of Supplemental Leak Collection & Release Sys Was Inoperable Due to Lack of Understanding of Flow Switch Response to Loss of Power Event.Formed Task Force & Design Changed (← links)
- 05000423/LER-1993-019-01, :on 931019,Wyle Lab Notified Util of Out of Tolerance Test Results on Two Previously Installed Pressurizer Safety Valves.Caused by Setpoint Drift.Ts Change Requests Being Submitted (← links)
- 05000423/LER-1993-004-01, :on 930331,RT Occurred Due to electro-hydraulic Control Power Supply Failure.Replaced Faulty Power Supply (← links)
- 05000423/LER-1993-011, :on 930731,MSSV Lift Setpoint Drift Occurred Due to Unknown Cause.Reduced Setpoint for Power Range Neutron Flux High Trip to 10% (← links)
- 05000423/LER-1990-024, :on 900620,control Bldg Isolations Occurred Due to Radiation Monitor Detector Degradation.Other Equipment Not Affected.Degradation Caused Radiation Levels to Exceed High Alarm Setpoint.Detector Replaced (← links)
- 05000423/LER-1990-025, :on 900616,hourly Vice Fire Watch Maintained During Condition That Required Continuous Fire Watch Be Established.Caused by Personnel Error.Continuous Fire Watch Established & Personnel Involved Counseled (← links)
- ML12107A027 (redirect page) (← links)
- 05000336/LER-2012-003, For Millstone Power Station, Unit 2, Regarding Potential for a Loss of Safety Functions Due to Postulated Flood Conditions (← links)
- 05000336/LER-2012-002, Completion of Plant Shutdown Required by Technical Specifications (← links)
- 05000336/LER-2012-001, Regarding Historical Gaps in High Energy Line Break Barrier (← links)